diff --git a/l10n/cs/viewer.properties b/l10n/cs/viewer.properties
index b7521dd29..49f88d7d1 100644
--- a/l10n/cs/viewer.properties
+++ b/l10n/cs/viewer.properties
@@ -246,9 +246,6 @@ editor_free_text2_label=Text
 editor_ink2.title=Kreslení
 editor_ink2_label=Kreslení
 
-editor_stamp.title=Přidat obrázek
-editor_stamp_label=Přidat obrázek
-
 editor_stamp1.title=Přidání či úprava obrázků
 editor_stamp1_label=Přidání či úprava obrázků
 
@@ -268,3 +265,20 @@ editor_stamp_add_image.title=Přidat obrázek
 editor_free_text2_aria_label=Textový editor
 editor_ink2_aria_label=Editor kreslení
 editor_ink_canvas_aria_label=Uživatelem vytvořený obrázek
+
+# Alt-text dialog
+# LOCALIZATION NOTE (editor_alt_text_button_label): Alternative text (alt text) helps
+# when people can't see the image.
+editor_alt_text_button_label=Náhradní popis
+editor_alt_text_edit_button_label=Upravit náhradní popis
+editor_alt_text_dialog_label=Vyberte možnost
+editor_alt_text_dialog_description=Náhradní popis pomáhá, když lidé obrázek nevidí nebo když se nenačítá.
+editor_alt_text_add_description_label=Přidat popis
+editor_alt_text_add_description_description=Snažte se o 1-2 věty, které popisují předmět, prostředí nebo činnosti.
+editor_alt_text_mark_decorative_label=Označit jako dekorativní
+editor_alt_text_mark_decorative_description=Používá se pro okrasné obrázky, jako jsou rámečky nebo vodoznaky.
+editor_alt_text_cancel_button=Zrušit
+editor_alt_text_save_button=Uložit
+editor_alt_text_decorative_tooltip=Označen jako dekorativní
+# This is a placeholder for the alt text input area
+editor_alt_text_textarea.placeholder=Například: “Mladý muž si sedá ke stolu, aby se najedl.”
diff --git a/l10n/dsb/viewer.properties b/l10n/dsb/viewer.properties
index e4e51d1eb..4094e149e 100644
--- a/l10n/dsb/viewer.properties
+++ b/l10n/dsb/viewer.properties
@@ -246,9 +246,6 @@ editor_free_text2_label=Tekst
 editor_ink2.title=Kresliś
 editor_ink2_label=Kresliś
 
-editor_stamp.title=Wobraz pśidaś
-editor_stamp_label=Wobraz pśidaś
-
 editor_stamp1.title=Wobraze pśidaś abo wobźěłaś
 editor_stamp1_label=Wobraze pśidaś abo wobźěłaś
 
@@ -268,3 +265,20 @@ editor_stamp_add_image.title=Wobraz pśidaś
 editor_free_text2_aria_label=Tekstowy editor
 editor_ink2_aria_label=Kresleński editor
 editor_ink_canvas_aria_label=Wobraz napórany wót wužywarja
+
+# Alt-text dialog
+# LOCALIZATION NOTE (editor_alt_text_button_label): Alternative text (alt text) helps
+# when people can't see the image.
+editor_alt_text_button_label=Alternatiwny tekst
+editor_alt_text_edit_button_label=Alternatiwny tekst wobźěłaś
+editor_alt_text_dialog_label=Nastajenje wubraś
+editor_alt_text_dialog_description=Alternatiwny tekst pomaga, gaž luźe njamógu wobraz wiźeś abo gaž se wobraz njezacytajo.
+editor_alt_text_add_description_label=Wopisanje pśidaś
+editor_alt_text_add_description_description=Pišćo 1 sadu abo 2 saźe, kótarejž temu, nastajenje abo akcije wopisujotej.
+editor_alt_text_mark_decorative_label=Ako dekoratiwny markěrowaś
+editor_alt_text_mark_decorative_description=To se za pyšnjece wobraze wužywa, na pśikład ramiki abo wódowe znamjenja.
+editor_alt_text_cancel_button=Pśetergnuś
+editor_alt_text_save_button=Składowaś
+editor_alt_text_decorative_tooltip=Ako dekoratiwny markěrowany
+# This is a placeholder for the alt text input area
+editor_alt_text_textarea.placeholder=Na pśikład, „Młody muski za blidom sejźi, aby jěź jědł“
diff --git a/l10n/en-GB/viewer.properties b/l10n/en-GB/viewer.properties
index 63fcec7ae..50f50f66d 100644
--- a/l10n/en-GB/viewer.properties
+++ b/l10n/en-GB/viewer.properties
@@ -246,9 +246,6 @@ editor_free_text2_label=Text
 editor_ink2.title=Draw
 editor_ink2_label=Draw
 
-editor_stamp.title=Add an image
-editor_stamp_label=Add an image
-
 editor_stamp1.title=Add or edit images
 editor_stamp1_label=Add or edit images
 
@@ -268,3 +265,20 @@ editor_stamp_add_image.title=Add image
 editor_free_text2_aria_label=Text Editor
 editor_ink2_aria_label=Draw Editor
 editor_ink_canvas_aria_label=User-created image
+
+# Alt-text dialog
+# LOCALIZATION NOTE (editor_alt_text_button_label): Alternative text (alt text) helps
+# when people can't see the image.
+editor_alt_text_button_label=Alt text
+editor_alt_text_edit_button_label=Edit alt text
+editor_alt_text_dialog_label=Choose an option
+editor_alt_text_dialog_description=Alt text (alternative text) helps when people can’t see the image or when it doesn’t load.
+editor_alt_text_add_description_label=Add a description
+editor_alt_text_add_description_description=Aim for 1-2 sentences that describe the subject, setting, or actions.
+editor_alt_text_mark_decorative_label=Mark as decorative
+editor_alt_text_mark_decorative_description=This is used for ornamental images, like borders or watermarks.
+editor_alt_text_cancel_button=Cancel
+editor_alt_text_save_button=Save
+editor_alt_text_decorative_tooltip=Marked as decorative
+# This is a placeholder for the alt text input area
+editor_alt_text_textarea.placeholder=For example, “A young man sits down at a table to eat a meal”
diff --git a/l10n/es-AR/viewer.properties b/l10n/es-AR/viewer.properties
index 9014658d4..63bb5389e 100644
--- a/l10n/es-AR/viewer.properties
+++ b/l10n/es-AR/viewer.properties
@@ -246,9 +246,6 @@ editor_free_text2_label=Texto
 editor_ink2.title=Dibujar
 editor_ink2_label=Dibujar
 
-editor_stamp.title=Agregar una imagen
-editor_stamp_label=Agregar una imagen
-
 editor_stamp1.title=Agregar o editar imágenes
 editor_stamp1_label=Agregar o editar imágenes
 
@@ -268,3 +265,20 @@ editor_stamp_add_image.title=Agregar una imagen
 editor_free_text2_aria_label=Editor de texto
 editor_ink2_aria_label=Editor de dibujos
 editor_ink_canvas_aria_label=Imagen creada por el usuario
+
+# Alt-text dialog
+# LOCALIZATION NOTE (editor_alt_text_button_label): Alternative text (alt text) helps
+# when people can't see the image.
+editor_alt_text_button_label=Texto alternativo
+editor_alt_text_edit_button_label=Editar el texto alternativo
+editor_alt_text_dialog_label=Eligir una opción
+editor_alt_text_dialog_description=El texto alternativo (texto alternativo) ayuda cuando las personas no pueden ver la imagen o cuando no se carga.
+editor_alt_text_add_description_label=Agregar una descripción
+editor_alt_text_add_description_description=Intente escribir 1 o 2 oraciones que describan el tema, el entorno o las acciones.
+editor_alt_text_mark_decorative_label=Marcar como decorativo
+editor_alt_text_mark_decorative_description=Esto se usa para imágenes ornamentales, como bordes o marcas de agua.
+editor_alt_text_cancel_button=Cancelar
+editor_alt_text_save_button=Guardar
+editor_alt_text_decorative_tooltip=Marcado como decorativo
+# This is a placeholder for the alt text input area
+editor_alt_text_textarea.placeholder=Por ejemplo: “Un joven se sienta a la mesa a comer”
diff --git a/l10n/es-CL/viewer.properties b/l10n/es-CL/viewer.properties
index c8d20e04f..b7996bc93 100644
--- a/l10n/es-CL/viewer.properties
+++ b/l10n/es-CL/viewer.properties
@@ -246,9 +246,6 @@ editor_free_text2_label=Texto
 editor_ink2.title=Dibujar
 editor_ink2_label=Dibujar
 
-editor_stamp.title=Añadir una imagen
-editor_stamp_label=Añadir una imagen
-
 editor_stamp1.title=Añadir o editar imágenes
 editor_stamp1_label=Añadir o editar imágenes
 
@@ -268,3 +265,20 @@ editor_stamp_add_image.title=Añadir imagen
 editor_free_text2_aria_label=Editor de texto
 editor_ink2_aria_label=Editor de dibujos
 editor_ink_canvas_aria_label=Imagen creada por el usuario
+
+# Alt-text dialog
+# LOCALIZATION NOTE (editor_alt_text_button_label): Alternative text (alt text) helps
+# when people can't see the image.
+editor_alt_text_button_label=Texto alternativo
+editor_alt_text_edit_button_label=Editar texto alternativo
+editor_alt_text_dialog_label=Elige una opción
+editor_alt_text_dialog_description=El texto alternativo (alt text) ayuda cuando las personas no pueden ver la imagen o cuando no se carga.
+editor_alt_text_add_description_label=Añade una descripción
+editor_alt_text_add_description_description=Intenta escribir 1 o 2 oraciones que describan el tema, el ambiente o las acciones.
+editor_alt_text_mark_decorative_label=Marcar como decorativa
+editor_alt_text_mark_decorative_description=Se utiliza para imágenes ornamentales, como bordes o marcas de agua.
+editor_alt_text_cancel_button=Cancelar
+editor_alt_text_save_button=Guardar
+editor_alt_text_decorative_tooltip=Marcada como decorativa
+# This is a placeholder for the alt text input area
+editor_alt_text_textarea.placeholder=Por ejemplo: “Un joven se sienta a la mesa a comer”
diff --git a/l10n/eu/viewer.properties b/l10n/eu/viewer.properties
index e312332e3..45ecd663b 100644
--- a/l10n/eu/viewer.properties
+++ b/l10n/eu/viewer.properties
@@ -246,9 +246,6 @@ editor_free_text2_label=Testua
 editor_ink2.title=Marrazkia
 editor_ink2_label=Marrazkia
 
-editor_stamp.title=Gehitu irudia
-editor_stamp_label=Gehitu irudia
-
 editor_stamp1.title=Gehitu edo editatu irudiak
 editor_stamp1_label=Gehitu edo editatu irudiak
 
@@ -268,3 +265,20 @@ editor_stamp_add_image.title=Gehitu irudia
 editor_free_text2_aria_label=Testu-editorea
 editor_ink2_aria_label=Marrazki-editorea
 editor_ink_canvas_aria_label=Erabiltzaileak sortutako irudia
+
+# Alt-text dialog
+# LOCALIZATION NOTE (editor_alt_text_button_label): Alternative text (alt text) helps
+# when people can't see the image.
+editor_alt_text_button_label=Testu alternatiboa
+editor_alt_text_edit_button_label=Editatu testu alternatiboa
+editor_alt_text_dialog_label=Aukeratu aukera
+editor_alt_text_dialog_description=Testu alternatiboak laguntzen du jendeak ezin duenean irudia ikusi edo ez denean kargatzen.
+editor_alt_text_add_description_label=Gehitu azalpena
+editor_alt_text_add_description_description=Saiatu idazten gaia, ezarpena edo ekintzak deskribatzen dituen esaldi 1 edo 2.
+editor_alt_text_mark_decorative_label=Markatu apaingarri gisa
+editor_alt_text_mark_decorative_description=Irudiak apaingarrientzat erabiltzen da, adibidez ertz edo ur-marketarako.
+editor_alt_text_cancel_button=Utzi
+editor_alt_text_save_button=Gorde
+editor_alt_text_decorative_tooltip=Apaingarri gisa markatuta
+# This is a placeholder for the alt text input area
+editor_alt_text_textarea.placeholder=Adibidez, "gizon gaztea mahaian eserita dago bazkaltzeko"
diff --git a/l10n/gl/viewer.properties b/l10n/gl/viewer.properties
index ddfd2030d..508ea5e47 100644
--- a/l10n/gl/viewer.properties
+++ b/l10n/gl/viewer.properties
@@ -41,6 +41,11 @@ print.title=Imprimir
 print_label=Imprimir
 save.title=Gardar
 save_label=Gardar
+# LOCALIZATION NOTE (download_button.title): used in Firefox for Android as a tooltip for the download button (“download” is a verb).
+download_button.title=Descargar
+# LOCALIZATION NOTE (download_button_label): used in Firefox for Android as a label for the download button (“download” is a verb).
+# Length of the translation matters since we are in a mobile context, with limited screen estate.
+download_button_label=Descargar
 bookmark1.title=Páxina actual (ver o URL da páxina actual)
 bookmark1_label=Páxina actual
 # LOCALIZATION NOTE (open_in_app.title): This string is used in Firefox for Android.
@@ -241,8 +246,8 @@ editor_free_text2_label=Texto
 editor_ink2.title=Debuxo
 editor_ink2_label=Debuxo
 
-editor_stamp.title=Engadir unha imaxe
-editor_stamp_label=Engadir unha imaxe
+editor_stamp1.title=Engadir ou editar imaxes
+editor_stamp1_label=Engadir ou editar imaxes
 
 free_text2_default_content=Comezar a teclear…
 
@@ -253,6 +258,9 @@ editor_ink_color=Cor
 editor_ink_thickness=Grosor
 editor_ink_opacity=Opacidade
 
+editor_stamp_add_image_label=Engadir imaxe
+editor_stamp_add_image.title=Engadir imaxe
+
 # Editor aria
 editor_free_text2_aria_label=Editor de texto
 editor_ink2_aria_label=Editor de debuxos
diff --git a/l10n/gn/viewer.properties b/l10n/gn/viewer.properties
index 52d27cc07..0ba9d36cc 100644
--- a/l10n/gn/viewer.properties
+++ b/l10n/gn/viewer.properties
@@ -65,18 +65,18 @@ page_rotate_cw_label=Aravóicha mbojere
 page_rotate_ccw.title=Aravo rapykue gotyo mbojere
 page_rotate_ccw_label=Aravo rapykue gotyo mbojere
 
-cursor_text_select_tool.title=Emyandy moñe’ẽrã jeporavo rembipuru
-cursor_text_select_tool_label=Moñe’ẽrã jeporavo rembipuru
+cursor_text_select_tool.title=Emyandy moñe’ẽrã jeporavo rembiporu
+cursor_text_select_tool_label=Moñe’ẽrã jeporavo rembiporu
 cursor_hand_tool.title=Tembiporu po pegua myandy
 cursor_hand_tool_label=Tembiporu po pegua
 
-scroll_page.title=Eipuru kuatiarogue jeku’e
+scroll_page.title=Eiporu kuatiarogue jeku’e
 scroll_page_label=Kuatiarogue jeku’e
-scroll_vertical.title=Eipuru jeku’e ykeguáva
+scroll_vertical.title=Eiporu jeku’e ykeguáva
 scroll_vertical_label=Jeku’e ykeguáva
-scroll_horizontal.title=Eipuru jeku’e yvate gotyo
+scroll_horizontal.title=Eiporu jeku’e yvate gotyo
 scroll_horizontal_label=Jeku’e yvate gotyo
-scroll_wrapped.title=Eipuru jeku’e mbohyrupyre
+scroll_wrapped.title=Eiporu jeku’e mbohyrupyre
 scroll_wrapped_label=Jeku’e mbohyrupyre
 
 spread_none.title=Ani ejuaju spreads kuatiarogue ndive
@@ -146,7 +146,7 @@ print_progress_close=Heja
 toggle_sidebar.title=Tenda yke moambue
 toggle_sidebar_notification2.title=Embojopyru tenda ykegua (kuatia oguereko kuaakaha/moirũha/ñuãha)
 toggle_sidebar_label=Tenda yke moambue
-document_outline.title=Ehechauka kuatia rape (eikutu mokõi jey embotuicha/emomichĩ hag̃ua opavavete mba’epuru)
+document_outline.title=Ehechauka kuatia rape (eikutu mokõi jey embotuicha/emomichĩ hag̃ua opavavete mba’eporu)
 document_outline_label=Kuatia apopyre
 attachments.title=Moirũha jehechauka
 attachments_label=Moirũha
@@ -154,8 +154,8 @@ layers.title=Ehechauka ñuãha (eikutu jo’a emomba’apo hag̃ua opaite ñuãh
 layers_label=Ñuãha
 thumbs.title=Mba’emirĩ jehechauka
 thumbs_label=Mba’emirĩ
-current_outline_item.title=Eheka mba’epuru ag̃aguaitéva
-current_outline_item_label=Mba’epuru ag̃aguaitéva
+current_outline_item.title=Eheka mba’eporu ag̃aguaitéva
+current_outline_item_label=Mba’eporu ag̃aguaitéva
 findbar.title=Kuatiápe jeheka
 findbar_label=Juhu
 
@@ -238,7 +238,7 @@ password_cancel=Heja
 
 printing_not_supported=Kyhyjerã: Ñembokuatia ndojokupytypái ko kundahára ndive.
 printing_not_ready=Kyhyjerã: Ko PDF nahenyhẽmbái oñembokuatia hag̃uáicha.
-web_fonts_disabled=Ñanduti taity oñemongéma: ndaikatumo’ãi eipuru PDF jehai’íva taity.
+web_fonts_disabled=Ñanduti taity oñemongéma: ndaikatumo’ãi eiporu PDF jehai’íva taity.
 
 # Editor
 editor_free_text2.title=Moñe’ẽrã
@@ -246,9 +246,6 @@ editor_free_text2_label=Moñe’ẽrã
 editor_ink2.title=Moha’ãnga
 editor_ink2_label=Moha’ãnga
 
-editor_stamp.title=Embojuaju ta’ãnga
-editor_stamp_label=Embojuaju ta’ãnga
-
 editor_stamp1.title=Embojuaju térã embosako’i ta’ãnga
 editor_stamp1_label=Embojuaju térã embosako’i ta’ãnga
 
@@ -268,3 +265,14 @@ editor_stamp_add_image.title=Embojuaju ta’ãnga
 editor_free_text2_aria_label=Moñe’ẽrã moheñoiha
 editor_ink2_aria_label=Ta’ãnga moheñoiha
 editor_ink_canvas_aria_label=Ta’ãnga omoheñóiva poruhára
+
+# Alt-text dialog
+# LOCALIZATION NOTE (editor_alt_text_button_label): Alternative text (alt text) helps
+# when people can't see the image.
+editor_alt_text_button_label=Moñe’ẽrã mokõiháva
+editor_alt_text_edit_button_label=Embojuruja moñe’ẽrã mokõiháva
+editor_alt_text_dialog_label=Eiporavo poravorã
+editor_alt_text_add_description_label=Embojuaju ñemoha’anga
+editor_alt_text_cancel_button=Heja
+editor_alt_text_save_button=Ñongatu
+# This is a placeholder for the alt text input area
diff --git a/l10n/he/viewer.properties b/l10n/he/viewer.properties
index 01ddd9cd5..306ff703b 100644
--- a/l10n/he/viewer.properties
+++ b/l10n/he/viewer.properties
@@ -245,9 +245,6 @@ editor_free_text2_label=טקסט
 editor_ink2.title=ציור
 editor_ink2_label=ציור
 
-editor_stamp.title=הוספת תמונה
-editor_stamp_label=הוספת תמונה
-
 editor_stamp1.title=הוספה או עריכת תמונות
 editor_stamp1_label=הוספה או עריכת תמונות
 
@@ -267,3 +264,20 @@ editor_stamp_add_image.title=הוספת תמונה
 editor_free_text2_aria_label=עורך טקסט
 editor_ink2_aria_label=עורך ציור
 editor_ink_canvas_aria_label=תמונה שנוצרה על־ידי משתמש
+
+# Alt-text dialog
+# LOCALIZATION NOTE (editor_alt_text_button_label): Alternative text (alt text) helps
+# when people can't see the image.
+editor_alt_text_button_label=טקסט חלופי
+editor_alt_text_edit_button_label=עריכת טקסט חלופי
+editor_alt_text_dialog_label=בחירת אפשרות
+editor_alt_text_dialog_description=טקסט חלופי עוזר כשאנשים לא יכולים לראות את התמונה או כשהיא לא נטענת.
+editor_alt_text_add_description_label=הוספת תיאור
+editor_alt_text_add_description_description=כדאי לתאר במשפט אחד או שניים את הנושא, התפאורה או הפעולות.
+editor_alt_text_mark_decorative_label=סימון כדקורטיבי
+editor_alt_text_mark_decorative_description=זה משמש לתמונות נוי, כמו גבולות או סימני מים.
+editor_alt_text_cancel_button=ביטול
+editor_alt_text_save_button=שמירה
+editor_alt_text_decorative_tooltip=מסומן כדקורטיבי
+# This is a placeholder for the alt text input area
+editor_alt_text_textarea.placeholder=לדוגמה, ״גבר צעיר מתיישב ליד שולחן לאכול ארוחה״
diff --git a/l10n/hsb/viewer.properties b/l10n/hsb/viewer.properties
index 98cbc7c7d..d96940d4d 100644
--- a/l10n/hsb/viewer.properties
+++ b/l10n/hsb/viewer.properties
@@ -246,9 +246,6 @@ editor_free_text2_label=Tekst
 editor_ink2.title=Rysować
 editor_ink2_label=Rysować
 
-editor_stamp.title=Wobraz přidać
-editor_stamp_label=Wobraz přidać
-
 editor_stamp1.title=Wobrazy přidać abo wobdźěłać
 editor_stamp1_label=Wobrazy přidać abo wobdźěłać
 
@@ -268,3 +265,20 @@ editor_stamp_add_image.title=Wobraz přidać
 editor_free_text2_aria_label=Tekstowy editor
 editor_ink2_aria_label=Rysowanski editor
 editor_ink_canvas_aria_label=Wobraz wutworjeny wot wužiwarja
+
+# Alt-text dialog
+# LOCALIZATION NOTE (editor_alt_text_button_label): Alternative text (alt text) helps
+# when people can't see the image.
+editor_alt_text_button_label=Alternatiwny tekst
+editor_alt_text_edit_button_label=Alternatiwny tekst wobdźěłać
+editor_alt_text_dialog_label=Nastajenje wubrać
+editor_alt_text_dialog_description=Alternatiwny tekst pomha, hdyž ludźo njemóža wobraz widźeć abo hdyž so wobraz njezačita.
+editor_alt_text_add_description_label=Wopisanje přidać
+editor_alt_text_add_description_description=Pisajće 1 sadu abo 2 sadźe, kotrejž temu, nastajenje abo akcije wopisujetej.
+editor_alt_text_mark_decorative_label=Jako dekoratiwny markěrować
+editor_alt_text_mark_decorative_description=To so za pyšace wobrazy wužiwa, na přikład ramiki abo wodowe znamjenja.
+editor_alt_text_cancel_button=Přetorhnyć
+editor_alt_text_save_button=Składować
+editor_alt_text_decorative_tooltip=Jako dekoratiwny markěrowany
+# This is a placeholder for the alt text input area
+editor_alt_text_textarea.placeholder=Na přikład, „Młody muž za blidom sedźi, zo by jědź jědł“
diff --git a/l10n/hu/viewer.properties b/l10n/hu/viewer.properties
index c3bceda6a..028aa058a 100644
--- a/l10n/hu/viewer.properties
+++ b/l10n/hu/viewer.properties
@@ -246,9 +246,6 @@ editor_free_text2_label=Szöveg
 editor_ink2.title=Rajzolás
 editor_ink2_label=Rajzolás
 
-editor_stamp.title=Kép hozzáadása
-editor_stamp_label=Kép hozzáadása
-
 editor_stamp1.title=Képek hozzáadása vagy szerkesztése
 editor_stamp1_label=Képek hozzáadása vagy szerkesztése
 
@@ -268,3 +265,20 @@ editor_stamp_add_image.title=Kép hozzáadása
 editor_free_text2_aria_label=Szövegszerkesztő
 editor_ink2_aria_label=Rajzszerkesztő
 editor_ink_canvas_aria_label=Felhasználó által készített kép
+
+# Alt-text dialog
+# LOCALIZATION NOTE (editor_alt_text_button_label): Alternative text (alt text) helps
+# when people can't see the image.
+editor_alt_text_button_label=Alternatív szöveg
+editor_alt_text_edit_button_label=Alternatív szöveg szerkesztése
+editor_alt_text_dialog_label=Válasszon egy lehetőséget
+editor_alt_text_dialog_description=Az alternatív szöveg segít, ha az emberek nem látják a képet, vagy ha az nem töltődik be.
+editor_alt_text_add_description_label=Leírás hozzáadása
+editor_alt_text_add_description_description=Törekedjen 1-2 mondatra, amely jellemzi a témát, környezetet vagy cselekvést.
+editor_alt_text_mark_decorative_label=Megjelölés dekoratívként
+editor_alt_text_mark_decorative_description=Ez a díszítőképeknél használatos, mint a szegélyek vagy a vízjelek.
+editor_alt_text_cancel_button=Mégse
+editor_alt_text_save_button=Mentés
+editor_alt_text_decorative_tooltip=Megjelölve dekoratívként
+# This is a placeholder for the alt text input area
+editor_alt_text_textarea.placeholder=Például: „Egy fiatal férfi leül enni egy asztalhoz”
diff --git a/l10n/ia/viewer.properties b/l10n/ia/viewer.properties
index 1c6878ec0..a0e296e75 100644
--- a/l10n/ia/viewer.properties
+++ b/l10n/ia/viewer.properties
@@ -246,9 +246,6 @@ editor_free_text2_label=Texto
 editor_ink2.title=Designar
 editor_ink2_label=Designar
 
-editor_stamp.title=Adder un imagine
-editor_stamp_label=Adder un imagine
-
 editor_stamp1.title=Adder o rediger imagines
 editor_stamp1_label=Adder o rediger imagines
 
@@ -268,3 +265,20 @@ editor_stamp_add_image.title=Adder imagine
 editor_free_text2_aria_label=Editor de texto
 editor_ink2_aria_label=Editor de designos
 editor_ink_canvas_aria_label=Imagine create per le usator
+
+# Alt-text dialog
+# LOCALIZATION NOTE (editor_alt_text_button_label): Alternative text (alt text) helps
+# when people can't see the image.
+editor_alt_text_button_label=Texto alternative
+editor_alt_text_edit_button_label=Rediger texto alternative
+editor_alt_text_dialog_label=Elige un option
+editor_alt_text_dialog_description=Le texto alternative (alt text) adjuta quando le personas non pote vider le imagine o quando illo non carga.
+editor_alt_text_add_description_label=Adder un description
+editor_alt_text_add_description_description=Mira a 1-2 phrases que describe le subjecto, parametro, o actiones.
+editor_alt_text_mark_decorative_label=Marcar como decorative
+editor_alt_text_mark_decorative_description=Isto es usate pro imagines ornamental, como bordaturas o filigranas.
+editor_alt_text_cancel_button=Cancellar
+editor_alt_text_save_button=Salvar
+editor_alt_text_decorative_tooltip=Marcate como decorative
+# This is a placeholder for the alt text input area
+editor_alt_text_textarea.placeholder=Per exemplo, “Un juvene sede a un tabula pro mangiar un repasto”
diff --git a/l10n/is/viewer.properties b/l10n/is/viewer.properties
index f5b492426..4b40c1b68 100644
--- a/l10n/is/viewer.properties
+++ b/l10n/is/viewer.properties
@@ -246,9 +246,6 @@ editor_free_text2_label=Texti
 editor_ink2.title=Teikna
 editor_ink2_label=Teikna
 
-editor_stamp.title=Bæta við mynd
-editor_stamp_label=Bæta við mynd
-
 editor_stamp1.title=Bæta við eða breyta myndum
 editor_stamp1_label=Bæta við eða breyta myndum
 
@@ -268,3 +265,20 @@ editor_stamp_add_image.title=Bæta við mynd
 editor_free_text2_aria_label=Textaritill
 editor_ink2_aria_label=Teikniritill
 editor_ink_canvas_aria_label=Mynd gerð af notanda
+
+# Alt-text dialog
+# LOCALIZATION NOTE (editor_alt_text_button_label): Alternative text (alt text) helps
+# when people can't see the image.
+editor_alt_text_button_label=Alt-varatexti
+editor_alt_text_edit_button_label=Breyta alt-varatexta
+editor_alt_text_dialog_label=Veldu valkost
+editor_alt_text_dialog_description=Alt-varatexti (auka-myndatexti) hjálpar þegar fólk getur ekki séð myndina eða þegar hún hleðst ekki inn.
+editor_alt_text_add_description_label=Bættu við lýsingu
+editor_alt_text_add_description_description=Reyndu að takmarka þetta við 1-2 setningar sem lýsa efninu, umhverfi eða aðgerðum.
+editor_alt_text_mark_decorative_label=Merkja sem skraut
+editor_alt_text_mark_decorative_description=Þetta er notað fyrir skrautmyndir, eins og borða eða vatnsmerki.
+editor_alt_text_cancel_button=Hætta við
+editor_alt_text_save_button=Vista
+editor_alt_text_decorative_tooltip=Merkt sem skraut
+# This is a placeholder for the alt text input area
+editor_alt_text_textarea.placeholder=Til dæmis: „Ungur maður sest við borð til að snæða máltíð“
diff --git a/l10n/it/viewer.properties b/l10n/it/viewer.properties
index d8aa13510..990642486 100644
--- a/l10n/it/viewer.properties
+++ b/l10n/it/viewer.properties
@@ -1,7 +1,3 @@
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
 # Copyright 2012 Mozilla Foundation
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
@@ -16,204 +12,273 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-previous.title = Pagina precedente
-previous_label = Precedente
-next.title = Pagina successiva
-next_label = Successiva
+# Main toolbar buttons (tooltips and alt text for images)
+previous.title=Pagina precedente
+previous_label=Precedente
+next.title=Pagina successiva
+next_label=Successiva
 
-page.title = Pagina
-of_pages = di {{pagesCount}}
-page_of_pages = ({{pageNumber}} di {{pagesCount}})
+# LOCALIZATION NOTE (page.title): The tooltip for the pageNumber input.
+page.title=Pagina
+# LOCALIZATION NOTE (of_pages): "{{pagesCount}}" will be replaced by a number
+# representing the total number of pages in the document.
+of_pages=di {{pagesCount}}
+# LOCALIZATION NOTE (page_of_pages): "{{pageNumber}}" and "{{pagesCount}}"
+# will be replaced by a number representing the currently visible page,
+# respectively a number representing the total number of pages in the document.
+page_of_pages=({{pageNumber}} di {{pagesCount}})
 
-zoom_out.title = Riduci zoom
-zoom_out_label = Riduci zoom
-zoom_in.title = Aumenta zoom
-zoom_in_label = Aumenta zoom
-zoom.title = Zoom
-presentation_mode.title = Passa alla modalità presentazione
-presentation_mode_label = Modalità presentazione
-open_file.title = Apri file
-open_file_label = Apri
-print.title = Stampa
-print_label = Stampa
+zoom_out.title=Riduci zoom
+zoom_out_label=Riduci zoom
+zoom_in.title=Aumenta zoom
+zoom_in_label=Aumenta zoom
+zoom.title=Zoom
+presentation_mode.title=Passa alla modalità presentazione
+presentation_mode_label=Modalità presentazione
+open_file.title=Apri file
+open_file_label=Apri
+print.title=Stampa
+print_label=Stampa
+save.title=Salva
+save_label=Salva
+# LOCALIZATION NOTE (download_button.title): used in Firefox for Android as a tooltip for the download button (“download” is a verb).
+download_button.title=Scarica
+# LOCALIZATION NOTE (download_button_label): used in Firefox for Android as a label for the download button (“download” is a verb).
+# Length of the translation matters since we are in a mobile context, with limited screen estate.
+download_button_label=Scarica
+bookmark1.title=Pagina corrente (mostra URL della pagina corrente)
+bookmark1_label=Pagina corrente
+# LOCALIZATION NOTE (open_in_app.title): This string is used in Firefox for Android.
+open_in_app.title=Apri in app
+# LOCALIZATION NOTE (open_in_app_label): This string is used in Firefox for Android. Length of the translation matters since we are in a mobile context, with limited screen estate.
+open_in_app_label=Apri in app
 
-save.title = Salva
-save_label = Salva
-download_button.title = Scarica
-download_button_label = Scarica
+# Secondary toolbar and context menu
+tools.title=Strumenti
+tools_label=Strumenti
+first_page.title=Vai alla prima pagina
+first_page_label=Vai alla prima pagina
+last_page.title=Vai all’ultima pagina
+last_page_label=Vai all’ultima pagina
+page_rotate_cw.title=Ruota in senso orario
+page_rotate_cw_label=Ruota in senso orario
+page_rotate_ccw.title=Ruota in senso antiorario
+page_rotate_ccw_label=Ruota in senso antiorario
 
-bookmark1.title = Pagina corrente (mostra URL della pagina corrente)
-bookmark1_label = Pagina corrente
-open_in_app.title = Apri in app
-open_in_app_label = Apri in app
+cursor_text_select_tool.title=Attiva strumento di selezione testo
+cursor_text_select_tool_label=Strumento di selezione testo
+cursor_hand_tool.title=Attiva strumento mano
+cursor_hand_tool_label=Strumento mano
 
-tools.title = Strumenti
-tools_label = Strumenti
-first_page.title = Vai alla prima pagina
-first_page_label = Vai alla prima pagina
-last_page.title = Vai all’ultima pagina
-last_page_label = Vai all’ultima pagina
-page_rotate_cw.title = Ruota in senso orario
-page_rotate_cw_label = Ruota in senso orario
-page_rotate_ccw.title = Ruota in senso antiorario
-page_rotate_ccw_label = Ruota in senso antiorario
+scroll_page.title=Utilizza scorrimento pagine
+scroll_page_label=Scorrimento pagine
+scroll_vertical.title=Scorri le pagine in verticale
+scroll_vertical_label=Scorrimento verticale
+scroll_horizontal.title=Scorri le pagine in orizzontale
+scroll_horizontal_label=Scorrimento orizzontale
+scroll_wrapped.title=Scorri le pagine in verticale, disponendole da sinistra a destra e andando a capo automaticamente
+scroll_wrapped_label=Scorrimento con a capo automatico
 
-cursor_text_select_tool.title = Attiva strumento di selezione testo
-cursor_text_select_tool_label = Strumento di selezione testo
-cursor_hand_tool.title = Attiva strumento mano
-cursor_hand_tool_label = Strumento mano
+spread_none.title=Non raggruppare pagine
+spread_none_label=Nessun raggruppamento
+spread_odd.title=Crea gruppi di pagine che iniziano con numeri di pagina dispari
+spread_odd_label=Raggruppamento dispari
+spread_even.title=Crea gruppi di pagine che iniziano con numeri di pagina pari
+spread_even_label=Raggruppamento pari
 
-scroll_page.title = Utilizza scorrimento pagine
-scroll_page_label = Scorrimento pagine
-scroll_vertical.title = Scorri le pagine in verticale
-scroll_vertical_label = Scorrimento verticale
-scroll_horizontal.title = Scorri le pagine in orizzontale
-scroll_horizontal_label = Scorrimento orizzontale
-scroll_wrapped.title = Scorri le pagine in verticale, disponendole da sinistra a destra e andando a capo automaticamente
-scroll_wrapped_label = Scorrimento con a capo automatico
+# Document properties dialog box
+document_properties.title=Proprietà del documento…
+document_properties_label=Proprietà del documento…
+document_properties_file_name=Nome file:
+document_properties_file_size=Dimensione file:
+# LOCALIZATION NOTE (document_properties_kb): "{{size_kb}}" and "{{size_b}}"
+# will be replaced by the PDF file size in kilobytes, respectively in bytes.
+document_properties_kb={{size_kb}} kB ({{size_b}} byte)
+# LOCALIZATION NOTE (document_properties_mb): "{{size_mb}}" and "{{size_b}}"
+# will be replaced by the PDF file size in megabytes, respectively in bytes.
+document_properties_mb={{size_mb}} MB ({{size_b}} byte)
+document_properties_title=Titolo:
+document_properties_author=Autore:
+document_properties_subject=Oggetto:
+document_properties_keywords=Parole chiave:
+document_properties_creation_date=Data creazione:
+document_properties_modification_date=Data modifica:
+# LOCALIZATION NOTE (document_properties_date_string): "{{date}}" and "{{time}}"
+# will be replaced by the creation/modification date, and time, of the PDF file.
+document_properties_date_string={{date}}, {{time}}
+document_properties_creator=Autore originale:
+document_properties_producer=Produttore PDF:
+document_properties_version=Versione PDF:
+document_properties_page_count=Conteggio pagine:
+document_properties_page_size=Dimensioni pagina:
+document_properties_page_size_unit_inches=in
+document_properties_page_size_unit_millimeters=mm
+document_properties_page_size_orientation_portrait=verticale
+document_properties_page_size_orientation_landscape=orizzontale
+document_properties_page_size_name_a3=A3
+document_properties_page_size_name_a4=A4
+document_properties_page_size_name_letter=Lettera
+document_properties_page_size_name_legal=Legale
+# LOCALIZATION NOTE (document_properties_page_size_dimension_string):
+# "{{width}}", "{{height}}", {{unit}}, and {{orientation}} will be replaced by
+# the size, respectively their unit of measurement and orientation, of the (current) page.
+document_properties_page_size_dimension_string={{width}} × {{height}} {{unit}} ({{orientation}})
+# LOCALIZATION NOTE (document_properties_page_size_dimension_name_string):
+# "{{width}}", "{{height}}", {{unit}}, {{name}}, and {{orientation}} will be replaced by
+# the size, respectively their unit of measurement, name, and orientation, of the (current) page.
+document_properties_page_size_dimension_name_string={{width}} × {{height}} {{unit}} ({{name}}, {{orientation}})
+# LOCALIZATION NOTE (document_properties_linearized): The linearization status of
+# the document; usually called "Fast Web View" in English locales of Adobe software.
+document_properties_linearized=Visualizzazione web veloce:
+document_properties_linearized_yes=Sì
+document_properties_linearized_no=No
+document_properties_close=Chiudi
 
-spread_none.title = Non raggruppare pagine
-spread_none_label = Nessun raggruppamento
-spread_odd.title = Crea gruppi di pagine che iniziano con numeri di pagina dispari
-spread_odd_label = Raggruppamento dispari
-spread_even.title = Crea gruppi di pagine che iniziano con numeri di pagina pari
-spread_even_label = Raggruppamento pari
+print_progress_message=Preparazione documento per la stampa…
+# LOCALIZATION NOTE (print_progress_percent): "{{progress}}" will be replaced by
+# a numerical per cent value.
+print_progress_percent={{progress}}%
+print_progress_close=Annulla
 
-document_properties.title = Proprietà del documento…
-document_properties_label = Proprietà del documento…
-document_properties_file_name = Nome file:
-document_properties_file_size = Dimensione file:
-document_properties_kb = {{size_kb}} kB ({{size_b}} byte)
-document_properties_mb = {{size_mb}} MB ({{size_b}} byte)
-document_properties_title = Titolo:
-document_properties_author = Autore:
-document_properties_subject = Oggetto:
-document_properties_keywords = Parole chiave:
-document_properties_creation_date = Data creazione:
-document_properties_modification_date = Data modifica:
-document_properties_date_string = {{date}}, {{time}}
-document_properties_creator = Autore originale:
-document_properties_producer = Produttore PDF:
-document_properties_version = Versione PDF:
-document_properties_page_count = Conteggio pagine:
-document_properties_page_size = Dimensioni pagina:
-document_properties_page_size_unit_inches = in
-document_properties_page_size_unit_millimeters = mm
-document_properties_page_size_orientation_portrait = verticale
-document_properties_page_size_orientation_landscape = orizzontale
-document_properties_page_size_name_a3 = A3
-document_properties_page_size_name_a4 = A4
-document_properties_page_size_name_letter = Lettera
-document_properties_page_size_name_legal = Legale
-document_properties_page_size_dimension_string = {{width}} × {{height}} {{unit}} ({{orientation}})
-document_properties_page_size_dimension_name_string = {{width}} × {{height}} {{unit}} ({{name}}, {{orientation}})
-document_properties_linearized = Visualizzazione web veloce:
-document_properties_linearized_yes = Sì
-document_properties_linearized_no = No
-document_properties_close = Chiudi
+# Tooltips and alt text for side panel toolbar buttons
+# (the _label strings are alt text for the buttons, the .title strings are
+# tooltips)
+toggle_sidebar.title=Attiva/disattiva barra laterale
+toggle_sidebar_notification2.title=Attiva/disattiva barra laterale (il documento contiene struttura/allegati/livelli)
+toggle_sidebar_label=Attiva/disattiva barra laterale
+document_outline.title=Visualizza la struttura del documento (doppio clic per visualizzare/comprimere tutti gli elementi)
+document_outline_label=Struttura documento
+attachments.title=Visualizza allegati
+attachments_label=Allegati
+layers.title=Visualizza livelli (doppio clic per ripristinare tutti i livelli allo stato predefinito)
+layers_label=Livelli
+thumbs.title=Mostra le miniature
+thumbs_label=Miniature
+current_outline_item.title=Trova elemento struttura corrente
+current_outline_item_label=Elemento struttura corrente
+findbar.title=Trova nel documento
+findbar_label=Trova
 
-print_progress_message = Preparazione documento per la stampa…
-print_progress_percent = {{progress}}%
-print_progress_close = Annulla
+additional_layers=Livelli aggiuntivi
+# LOCALIZATION NOTE (page_landmark): "{{page}}" will be replaced by the page number.
+page_landmark=Pagina {{page}}
+# Thumbnails panel item (tooltip and alt text for images)
+# LOCALIZATION NOTE (thumb_page_title): "{{page}}" will be replaced by the page
+# number.
+thumb_page_title=Pagina {{page}}
+# LOCALIZATION NOTE (thumb_page_canvas): "{{page}}" will be replaced by the page
+# number.
+thumb_page_canvas=Miniatura della pagina {{page}}
 
-toggle_sidebar.title = Attiva/disattiva barra laterale
-toggle_sidebar_notification2.title = Attiva/disattiva barra laterale (il documento contiene struttura/allegati/livelli)
-toggle_sidebar_label = Attiva/disattiva barra laterale
-document_outline.title = Visualizza la struttura del documento (doppio clic per visualizzare/comprimere tutti gli elementi)
-document_outline_label = Struttura documento
-attachments.title = Visualizza allegati
-attachments_label = Allegati
-layers.title = Visualizza livelli (doppio clic per ripristinare tutti i livelli allo stato predefinito)
-layers_label = Livelli
-thumbs.title = Mostra le miniature
-thumbs_label = Miniature
-current_outline_item.title = Trova elemento struttura corrente
-current_outline_item_label = Elemento struttura corrente
-findbar.title = Trova nel documento
-findbar_label = Trova
+# Find panel button title and messages
+find_input.title=Trova
+find_input.placeholder=Trova nel documento…
+find_previous.title=Trova l’occorrenza precedente del testo da cercare
+find_previous_label=Precedente
+find_next.title=Trova l’occorrenza successiva del testo da cercare
+find_next_label=Successivo
+find_highlight=Evidenzia
+find_match_case_label=Maiuscole/minuscole
+find_match_diacritics_label=Segni diacritici
+find_entire_word_label=Parole intere
+find_reached_top=Raggiunto l’inizio della pagina, continua dalla fine
+find_reached_bottom=Raggiunta la fine della pagina, continua dall’inizio
+# LOCALIZATION NOTE (find_match_count): The supported plural forms are
+# [one|two|few|many|other], with [other] as the default value.
+# "{{current}}" and "{{total}}" will be replaced by a number representing the
+# index of the currently active find result, respectively a number representing
+# the total number of matches in the document.
+find_match_count={[ plural(total) ]}
+find_match_count[one]={{current}} di {{total}} corrispondenza
+find_match_count[two]={{current}} di {{total}} corrispondenze
+find_match_count[few]={{current}} di {{total}} corrispondenze
+find_match_count[many]={{current}} di {{total}} corrispondenze
+find_match_count[other]={{current}} di {{total}} corrispondenze
+# LOCALIZATION NOTE (find_match_count_limit): The supported plural forms are
+# [zero|one|two|few|many|other], with [other] as the default value.
+# "{{limit}}" will be replaced by a numerical value.
+find_match_count_limit={[ plural(limit) ]}
+find_match_count_limit[zero]=Più di {{limit}} corrispondenze
+find_match_count_limit[one]=Più di {{limit}} corrispondenza
+find_match_count_limit[two]=Più di {{limit}} corrispondenze
+find_match_count_limit[few]=Più di {{limit}} corrispondenze
+find_match_count_limit[many]=Più di {{limit}} corrispondenze
+find_match_count_limit[other]=Più di {{limit}} corrispondenze
+find_not_found=Testo non trovato
 
-additional_layers = Livelli aggiuntivi
-page_landmark = Pagina {{page}}
-thumb_page_title = Pagina {{page}}
-thumb_page_canvas = Miniatura della pagina {{page}}
+# Predefined zoom values
+page_scale_width=Larghezza pagina
+page_scale_fit=Adatta a una pagina
+page_scale_auto=Zoom automatico
+page_scale_actual=Dimensioni effettive
+# LOCALIZATION NOTE (page_scale_percent): "{{scale}}" will be replaced by a
+# numerical scale value.
+page_scale_percent={{scale}}%
 
-find_input.title = Trova
-find_input.placeholder = Trova nel documento…
-find_previous.title = Trova l’occorrenza precedente del testo da cercare
-find_previous_label = Precedente
-find_next.title = Trova l’occorrenza successiva del testo da cercare
-find_next_label = Successivo
-find_highlight = Evidenzia
-find_match_case_label = Maiuscole/minuscole
-find_match_diacritics_label = Segni diacritici
-find_entire_word_label = Parole intere
-find_reached_top = Raggiunto l’inizio della pagina, continua dalla fine
-find_reached_bottom = Raggiunta la fine della pagina, continua dall’inizio
-find_match_count = {[ plural(total) ]}
-find_match_count[one] = {{current}} di {{total}} corrispondenza
-find_match_count[two] = {{current}} di {{total}} corrispondenze
-find_match_count[few] = {{current}} di {{total}} corrispondenze
-find_match_count[many] = {{current}} di {{total}} corrispondenze
-find_match_count[other] = {{current}} di {{total}} corrispondenze
-find_match_count_limit = {[ plural(limit) ]}
-find_match_count_limit[zero] = Più di {{limit}} corrispondenze
-find_match_count_limit[one] = Più di {{limit}} corrispondenza
-find_match_count_limit[two] = Più di {{limit}} corrispondenze
-find_match_count_limit[few] = Più di {{limit}} corrispondenze
-find_match_count_limit[many] = Più di {{limit}} corrispondenze
-find_match_count_limit[other] = Più di {{limit}} corrispondenze
-find_not_found = Testo non trovato
+# Loading indicator messages
+loading_error=Si è verificato un errore durante il caricamento del PDF.
+invalid_file_error=File PDF non valido o danneggiato.
+missing_file_error=File PDF non disponibile.
+unexpected_response_error=Risposta imprevista del server
+rendering_error=Si è verificato un errore durante il rendering della pagina.
 
-page_scale_width = Larghezza pagina
-page_scale_fit = Adatta a una pagina
-page_scale_auto = Zoom automatico
-page_scale_actual = Dimensioni effettive
-page_scale_percent = {{scale}}%
+# LOCALIZATION NOTE (annotation_date_string): "{{date}}" and "{{time}}" will be
+# replaced by the modification date, and time, of the annotation.
+annotation_date_string={{date}}, {{time}}
 
-loading_error = Si è verificato un errore durante il caricamento del PDF.
-invalid_file_error = File PDF non valido o danneggiato.
-missing_file_error = File PDF non disponibile.
-unexpected_response_error = Risposta imprevista del server
+# LOCALIZATION NOTE (text_annotation_type.alt): This is used as a tooltip.
+# "{{type}}" will be replaced with an annotation type from a list defined in
+# the PDF spec (32000-1:2008 Table 169 – Annotation types).
+# Some common types are e.g.: "Check", "Text", "Comment", "Note"
+text_annotation_type.alt=[Annotazione: {{type}}]
+password_label=Inserire la password per aprire questo file PDF.
+password_invalid=Password non corretta. Riprovare.
+password_ok=OK
+password_cancel=Annulla
 
-rendering_error = Si è verificato un errore durante il rendering della pagina.
-
-annotation_date_string = {{date}}, {{time}}
-
-text_annotation_type.alt = [Annotazione: {{type}}]
-password_label = Inserire la password per aprire questo file PDF.
-password_invalid = Password non corretta. Riprovare.
-password_ok = OK
-password_cancel = Annulla
-
-printing_not_supported = Attenzione: la stampa non è completamente supportata da questo browser.
-printing_not_ready = Attenzione: il PDF non è ancora stato caricato completamente per la stampa.
-web_fonts_disabled = I web font risultano disattivati: impossibile utilizzare i caratteri incorporati nel PDF.
+printing_not_supported=Attenzione: la stampa non è completamente supportata da questo browser.
+printing_not_ready=Attenzione: il PDF non è ancora stato caricato completamente per la stampa.
+web_fonts_disabled=I web font risultano disattivati: impossibile utilizzare i caratteri incorporati nel PDF.
 
 # Editor
-editor_free_text2.title = Testo
-editor_free_text2_label = Testo
-editor_ink2.title = Disegno
-editor_ink2_label = Disegno
-editor_stamp.title = Aggiungi un’immagine
-editor_stamp_label = Aggiungi un’immagine
-editor_stamp1.title = Aggiungi o rimuovi immagine
-editor_stamp1_label = Aggiungi o rimuovi immagine
+editor_free_text2.title=Testo
+editor_free_text2_label=Testo
+editor_ink2.title=Disegno
+editor_ink2_label=Disegno
 
-free_text2_default_content = Inizia a digitare…
+editor_stamp1.title=Aggiungi o rimuovi immagine
+editor_stamp1_label=Aggiungi o rimuovi immagine
+
+free_text2_default_content=Inizia a digitare…
 
 # Editor Parameters
-editor_free_text_color = Colore
-editor_free_text_size = Dimensione
-editor_ink_color = Colore
-editor_ink_thickness = Spessore
-editor_ink_opacity = Opacità
-editor_stamp_add_image_label = Aggiungi immagine
-editor_stamp_add_image.title = Aggiungi immagine
+editor_free_text_color=Colore
+editor_free_text_size=Dimensione
+editor_ink_color=Colore
+editor_ink_thickness=Spessore
+editor_ink_opacity=Opacità
+
+editor_stamp_add_image_label=Aggiungi immagine
+editor_stamp_add_image.title=Aggiungi immagine
 
 # Editor aria
-editor_free_text2_aria_label = Editor di testo
-editor_ink2_aria_label = Editor disegni
-editor_ink_canvas_aria_label = Immagine creata dall’utente
-
-
+editor_free_text2_aria_label=Editor di testo
+editor_ink2_aria_label=Editor disegni
+editor_ink_canvas_aria_label=Immagine creata dall’utente
 
+# Alt-text dialog
+# LOCALIZATION NOTE (editor_alt_text_button_label): Alternative text (alt text) helps
+# when people can't see the image.
+editor_alt_text_button_label=Testo alternativo
+editor_alt_text_edit_button_label=Modifica testo alternativo
+editor_alt_text_dialog_label=Scegli un’opzione
+editor_alt_text_dialog_description=Il testo alternativo (“alt text”) aiuta quando le persone non possono vedere l’immagine o quando l’immagine non viene caricata.
+editor_alt_text_add_description_label=Aggiungi una descrizione
+editor_alt_text_add_description_description=Punta a una o due frasi che descrivono l’argomento, l’ambientazione o le azioni.
+editor_alt_text_mark_decorative_label=Contrassegna come decorativa
+editor_alt_text_mark_decorative_description=Viene utilizzato per immagini ornamentali, come bordi o filigrane.
+editor_alt_text_cancel_button=Annulla
+editor_alt_text_save_button=Salva
+editor_alt_text_decorative_tooltip=Contrassegnata come decorativa
+# This is a placeholder for the alt text input area
+editor_alt_text_textarea.placeholder=Ad esempio, “Un giovane si siede a tavola per mangiare”
diff --git a/l10n/ka/viewer.properties b/l10n/ka/viewer.properties
index 1130a9539..9ea7a963d 100644
--- a/l10n/ka/viewer.properties
+++ b/l10n/ka/viewer.properties
@@ -246,9 +246,6 @@ editor_free_text2_label=ტექსტი
 editor_ink2.title=დახატვა
 editor_ink2_label=დახატვა
 
-editor_stamp.title=სურათის დამატება
-editor_stamp_label=სურათის დამატება
-
 editor_stamp1.title=სურათების დამატება ან ჩასწორება
 editor_stamp1_label=სურათების დამატება ან ჩასწორება
 
@@ -268,3 +265,20 @@ editor_stamp_add_image.title=სურათის დამატება
 editor_free_text2_aria_label=ნაწერის ჩასწორება
 editor_ink2_aria_label=ნახატის ჩასწორება
 editor_ink_canvas_aria_label=მომხმარებლის შექმნილი სურათი
+
+# Alt-text dialog
+# LOCALIZATION NOTE (editor_alt_text_button_label): Alternative text (alt text) helps
+# when people can't see the image.
+editor_alt_text_button_label=დართული წარწერა
+editor_alt_text_edit_button_label=დართული წარწერის ჩასწორება
+editor_alt_text_dialog_label=არჩევა
+editor_alt_text_dialog_description=დართული წარწერა (შემნაცვლებელი ტექსტი) გამოსადეგია მათთვის, ვინც ვერ ხედავს სურათებს ან როცა სურათი ვერ იტვირთება.
+editor_alt_text_add_description_label=აღწერილობის დამატება
+editor_alt_text_add_description_description=განკუთვნილია 1-2 წინადადებით საგნის, მახასიათებლის ან მოქმედების აღსაწერად.
+editor_alt_text_mark_decorative_label=მოინიშნოს მოსართავად
+editor_alt_text_mark_decorative_description=გამოიყენება შესამკობი სურათებისთვის, გარსშემოსავლები ჩარჩოებისა და ჭვირნიშნებისთვის.
+editor_alt_text_cancel_button=გაუქმება
+editor_alt_text_save_button=შენახვა
+editor_alt_text_decorative_tooltip=მოინიშნოს მოსართავად
+# This is a placeholder for the alt text input area
+editor_alt_text_textarea.placeholder=მაგალითად, „ახალგაზრდა მამაკაცი მაგიდასთან ზის და სადილობს“
diff --git a/l10n/kk/viewer.properties b/l10n/kk/viewer.properties
index 778e36d5f..920f0a3bb 100644
--- a/l10n/kk/viewer.properties
+++ b/l10n/kk/viewer.properties
@@ -246,9 +246,6 @@ editor_free_text2_label=Мәтін
 editor_ink2.title=Сурет салу
 editor_ink2_label=Сурет салу
 
-editor_stamp.title=Суретті қосу
-editor_stamp_label=Суретті қосу
-
 editor_stamp1.title=Суреттерді қосу немесе түзету
 editor_stamp1_label=Суреттерді қосу немесе түзету
 
@@ -268,3 +265,20 @@ editor_stamp_add_image.title=Суретті қосу
 editor_free_text2_aria_label=Мәтін түзеткіші
 editor_ink2_aria_label=Сурет түзеткіші
 editor_ink_canvas_aria_label=Пайдаланушы жасаған сурет
+
+# Alt-text dialog
+# LOCALIZATION NOTE (editor_alt_text_button_label): Alternative text (alt text) helps
+# when people can't see the image.
+editor_alt_text_button_label=Балама мәтін
+editor_alt_text_edit_button_label=Балама мәтінді өңдеу
+editor_alt_text_dialog_label=Опцияны таңдау
+editor_alt_text_dialog_description=Балама мәтін адамдар суретті көре алмағанда немесе ол жүктелмегенде көмектеседі.
+editor_alt_text_add_description_label=Сипаттаманы қосу
+editor_alt_text_add_description_description=Тақырыпты, баптауды немесе әрекетті сипаттайтын 1-2 сөйлемді қолдануға тырысыңыз.
+editor_alt_text_mark_decorative_label=Декоративті деп белгілеу
+editor_alt_text_mark_decorative_description=Бұл жиектер немесе су белгілері сияқты оюлық суреттер үшін пайдаланылады.
+editor_alt_text_cancel_button=Бас тарту
+editor_alt_text_save_button=Сақтау
+editor_alt_text_decorative_tooltip=Декоративті деп белгіленген
+# This is a placeholder for the alt text input area
+editor_alt_text_textarea.placeholder=Мысалы, "Жас жігіт тамақ ішу үшін үстел басына отырады"
diff --git a/l10n/ko/viewer.properties b/l10n/ko/viewer.properties
index 03ee0d7e0..da4b02394 100644
--- a/l10n/ko/viewer.properties
+++ b/l10n/ko/viewer.properties
@@ -246,9 +246,6 @@ editor_free_text2_label=텍스트
 editor_ink2.title=그리기
 editor_ink2_label=그리기
 
-editor_stamp.title=이미지 추가
-editor_stamp_label=이미지 추가
-
 editor_stamp1.title=이미지 추가 또는 편집
 editor_stamp1_label=이미지 추가 또는 편집
 
@@ -268,3 +265,20 @@ editor_stamp_add_image.title=이미지 추가
 editor_free_text2_aria_label=텍스트 편집기
 editor_ink2_aria_label=그리기 편집기
 editor_ink_canvas_aria_label=사용자 생성 이미지
+
+# Alt-text dialog
+# LOCALIZATION NOTE (editor_alt_text_button_label): Alternative text (alt text) helps
+# when people can't see the image.
+editor_alt_text_button_label=대체 텍스트
+editor_alt_text_edit_button_label=대체 텍스트 편집
+editor_alt_text_dialog_label=옵션을 선택하세요
+editor_alt_text_dialog_description=대체 텍스트는 사람들이 이미지를 볼 수 없거나 이미지가 로드되지 않을 때 도움이 됩니다.
+editor_alt_text_add_description_label=설명 추가
+editor_alt_text_add_description_description=주제, 설정, 동작을 설명하는 1~2개의 문장을 목표로 하세요.
+editor_alt_text_mark_decorative_label=장식용으로 표시
+editor_alt_text_mark_decorative_description=테두리나 워터마크와 같은 장식적인 이미지에 사용됩니다.
+editor_alt_text_cancel_button=취소
+editor_alt_text_save_button=저장
+editor_alt_text_decorative_tooltip=장식용으로 표시됨
+# This is a placeholder for the alt text input area
+editor_alt_text_textarea.placeholder=예를 들어, “한 청년이 식탁에 앉아 식사를 하고 있습니다.”
diff --git a/l10n/nb-NO/viewer.properties b/l10n/nb-NO/viewer.properties
index ec7675a6e..810453152 100644
--- a/l10n/nb-NO/viewer.properties
+++ b/l10n/nb-NO/viewer.properties
@@ -246,9 +246,6 @@ editor_free_text2_label=Tekst
 editor_ink2.title=Tegn
 editor_ink2_label=Tegn
 
-editor_stamp.title=Legg til et bilde
-editor_stamp_label=Legg til et bilde
-
 editor_stamp1.title=Legg til eller rediger bilder
 editor_stamp1_label=Legg til eller rediger bilder
 
@@ -268,3 +265,20 @@ editor_stamp_add_image.title=Legg til bilde
 editor_free_text2_aria_label=Tekstredigering
 editor_ink2_aria_label=Tegneredigering
 editor_ink_canvas_aria_label=Brukerskapt bilde
+
+# Alt-text dialog
+# LOCALIZATION NOTE (editor_alt_text_button_label): Alternative text (alt text) helps
+# when people can't see the image.
+editor_alt_text_button_label=Alt-tekst
+editor_alt_text_edit_button_label=Rediger alt-tekst tekst
+editor_alt_text_dialog_label=Velg et alternativ
+editor_alt_text_dialog_description=Alt-tekst (alternativ tekst) hjelper når folk ikke kan se bildet eller når det ikke lastes inn.
+editor_alt_text_add_description_label=Legg til en beskrivelse
+editor_alt_text_add_description_description=Gå etter 1-2 setninger som beskriver emnet, settingen eller handlingene.
+editor_alt_text_mark_decorative_label=Merk som dekorativt
+editor_alt_text_mark_decorative_description=Dette brukes til dekorative bilder, som kantlinjer eller vannmerker.
+editor_alt_text_cancel_button=Avbryt
+editor_alt_text_save_button=Lagre
+editor_alt_text_decorative_tooltip=Merket som dekorativ
+# This is a placeholder for the alt text input area
+editor_alt_text_textarea.placeholder=For eksempel, «En ung mann setter seg ved et bord for å spise et måltid»
diff --git a/l10n/nl/viewer.properties b/l10n/nl/viewer.properties
index a1796af57..c428dac58 100644
--- a/l10n/nl/viewer.properties
+++ b/l10n/nl/viewer.properties
@@ -246,9 +246,6 @@ editor_free_text2_label=Tekst
 editor_ink2.title=Tekenen
 editor_ink2_label=Tekenen
 
-editor_stamp.title=Afbeelding toevoegen
-editor_stamp_label=Afbeelding toevoegen
-
 editor_stamp1.title=Afbeeldingen toevoegen of bewerken
 editor_stamp1_label=Afbeeldingen toevoegen of bewerken
 
@@ -268,3 +265,10 @@ editor_stamp_add_image.title=Afbeelding toevoegen
 editor_free_text2_aria_label=Tekstbewerker
 editor_ink2_aria_label=Tekeningbewerker
 editor_ink_canvas_aria_label=Door gebruiker gemaakte afbeelding
+
+# Alt-text dialog
+# LOCALIZATION NOTE (editor_alt_text_button_label): Alternative text (alt text) helps
+# when people can't see the image.
+editor_alt_text_cancel_button=Annuleren
+editor_alt_text_save_button=Opslaan
+# This is a placeholder for the alt text input area
diff --git a/l10n/oc/viewer.properties b/l10n/oc/viewer.properties
index a9920c1c2..2afe8efd1 100644
--- a/l10n/oc/viewer.properties
+++ b/l10n/oc/viewer.properties
@@ -246,9 +246,6 @@ editor_free_text2_label=Tèxte
 editor_ink2.title=Dessenhar
 editor_ink2_label=Dessenhar
 
-editor_stamp.title=Ajustar un imatge
-editor_stamp_label=Ajustar un imatge
-
 editor_stamp1.title=Apondre o modificar d’imatges
 editor_stamp1_label=Apondre o modificar d’imatges
 
@@ -268,3 +265,14 @@ editor_stamp_add_image.title=Apondre imatge
 editor_free_text2_aria_label=Editor de tèxte
 editor_ink2_aria_label=Editor de dessenh
 editor_ink_canvas_aria_label=Imatge creat per l’utilizaire
+
+# Alt-text dialog
+# LOCALIZATION NOTE (editor_alt_text_button_label): Alternative text (alt text) helps
+# when people can't see the image.
+editor_alt_text_button_label=Tèxt alternatiu
+editor_alt_text_edit_button_label=Modificar lo tèxt alternatiu
+editor_alt_text_dialog_label=Causir una opcion
+editor_alt_text_add_description_label=Apondre una descripcion
+editor_alt_text_cancel_button=Anullar
+editor_alt_text_save_button=Enregistrar
+# This is a placeholder for the alt text input area
diff --git a/l10n/pa-IN/viewer.properties b/l10n/pa-IN/viewer.properties
index 56ae6bfef..2cb316fbf 100644
--- a/l10n/pa-IN/viewer.properties
+++ b/l10n/pa-IN/viewer.properties
@@ -39,13 +39,18 @@ open_file.title=ਫਾਈਲ ਨੂੰ ਖੋਲ੍ਹੋ
 open_file_label=ਖੋਲ੍ਹੋ
 print.title=ਪਰਿੰਟ
 print_label=ਪਰਿੰਟ
-
 save.title=ਸੰਭਾਲੋ
 save_label=ਸੰਭਾਲੋ
+# LOCALIZATION NOTE (download_button.title): used in Firefox for Android as a tooltip for the download button (“download” is a verb).
+download_button.title=ਡਾਊਨਲੋਡ
+# LOCALIZATION NOTE (download_button_label): used in Firefox for Android as a label for the download button (“download” is a verb).
+# Length of the translation matters since we are in a mobile context, with limited screen estate.
+download_button_label=ਡਾਊਨਲੋਡ
 bookmark1.title=ਮੌਜੂਦਾ ਸਫ਼਼ਾ (ਮੌਜੂਦਾ ਸਫ਼ੇ ਤੋਂ URL ਵੇਖੋ)
 bookmark1_label=ਮੌਜੂਦਾ ਸਫ਼਼ਾ
-
+# LOCALIZATION NOTE (open_in_app.title): This string is used in Firefox for Android.
 open_in_app.title=ਐਪ ਵਿੱਚ ਖੋਲ੍ਹੋ
+# LOCALIZATION NOTE (open_in_app_label): This string is used in Firefox for Android. Length of the translation matters since we are in a mobile context, with limited screen estate.
 open_in_app_label=ਐਪ ਵਿੱਚ ਖੋਲ੍ਹੋ
 
 # Secondary toolbar and context menu
@@ -215,7 +220,6 @@ loading_error=PDF ਲੋਡ ਕਰਨ ਦੇ ਦੌਰਾਨ ਗਲਤੀ ਆਈ
 invalid_file_error=ਗਲਤ ਜਾਂ ਨਿਕਾਰਾ PDF ਫਾਈਲ ਹੈ।
 missing_file_error=ਨਾ-ਮੌਜੂਦ PDF ਫਾਈਲ।
 unexpected_response_error=ਅਣਜਾਣ ਸਰਵਰ ਜਵਾਬ।
-
 rendering_error=ਸਫ਼ਾ ਰੈਡਰ ਕਰਨ ਦੇ ਦੌਰਾਨ ਗਲਤੀ ਆਈ ਹੈ।
 
 # LOCALIZATION NOTE (annotation_date_string): "{{date}}" and "{{time}}" will be
@@ -242,6 +246,12 @@ editor_free_text2_label=ਲਿਖਤ
 editor_ink2.title=ਵਾਹੋ
 editor_ink2_label=ਵਾਹੋ
 
+editor_stamp.title=ਚਿੱਤਰ ਜੋੜੋ
+editor_stamp_label=ਚਿੱਤਰ ਜੋੜੋ
+
+editor_stamp1.title=ਚਿੱਤਰ ਜੋੜੋ ਜਾਂ ਸੋਧੋ
+editor_stamp1_label=ਚਿੱਤਰ ਜੋੜੋ ਜਾਂ ਸੋਧੋ
+
 free_text2_default_content=…ਲਿਖਣਾ ਸ਼ੁਰੂ ਕਰੋ
 
 # Editor Parameters
@@ -251,6 +261,9 @@ editor_ink_color=ਰੰਗ
 editor_ink_thickness=ਮੋਟਾਈ
 editor_ink_opacity=ਧੁੰਦਲਾਪਨ
 
+editor_stamp_add_image_label=ਚਿੱਤਰ ਜੋੜੋ
+editor_stamp_add_image.title=ਚਿੱਤਰ ਜੋੜੋ
+
 # Editor aria
 editor_free_text2_aria_label=ਲਿਖਤ ਐਡੀਟਰ
 editor_ink2_aria_label=ਵਹਾਉਣ ਐਡੀਟਰ
diff --git a/l10n/sl/viewer.properties b/l10n/sl/viewer.properties
index 70dfc39bf..29254c12c 100644
--- a/l10n/sl/viewer.properties
+++ b/l10n/sl/viewer.properties
@@ -246,9 +246,6 @@ editor_free_text2_label=Besedilo
 editor_ink2.title=Riši
 editor_ink2_label=Riši
 
-editor_stamp.title=Dodaj sliko
-editor_stamp_label=Dodaj sliko
-
 editor_stamp1.title=Dodajanje ali urejanje slik
 editor_stamp1_label=Dodajanje ali urejanje slik
 
@@ -268,3 +265,20 @@ editor_stamp_add_image.title=Dodaj sliko
 editor_free_text2_aria_label=Urejevalnik besedila
 editor_ink2_aria_label=Urejevalnik risanja
 editor_ink_canvas_aria_label=Uporabnikova slika
+
+# Alt-text dialog
+# LOCALIZATION NOTE (editor_alt_text_button_label): Alternative text (alt text) helps
+# when people can't see the image.
+editor_alt_text_button_label=Nadomestno besedilo
+editor_alt_text_edit_button_label=Uredi nadomestno besedilo
+editor_alt_text_dialog_label=Izberite možnost
+editor_alt_text_dialog_description=Nadomestno besedilo se prikaže tistim, ki ne vidijo slike, ali če se ta ne naloži.
+editor_alt_text_add_description_label=Dodaj opis
+editor_alt_text_add_description_description=Poskušajte v enem ali dveh stavkih opisati motiv, okolje ali dejanja.
+editor_alt_text_mark_decorative_label=Označi kot okrasno
+editor_alt_text_mark_decorative_description=Uporablja se za slike, ki služijo samo okrasu, na primer obrobe ali vodne žige.
+editor_alt_text_cancel_button=Prekliči
+editor_alt_text_save_button=Shrani
+editor_alt_text_decorative_tooltip=Označeno kot okrasno
+# This is a placeholder for the alt text input area
+editor_alt_text_textarea.placeholder=Na primer: "Mladenič sedi za mizo pri jedi"
diff --git a/l10n/sv-SE/viewer.properties b/l10n/sv-SE/viewer.properties
index 56f24bd73..a15d2b68e 100644
--- a/l10n/sv-SE/viewer.properties
+++ b/l10n/sv-SE/viewer.properties
@@ -246,9 +246,6 @@ editor_free_text2_label=Text
 editor_ink2.title=Rita
 editor_ink2_label=Rita
 
-editor_stamp.title=Lägg till en bild
-editor_stamp_label=Lägg till en bild
-
 editor_stamp1.title=Lägg till eller redigera bilder
 editor_stamp1_label=Lägg till eller redigera bilder
 
@@ -268,3 +265,20 @@ editor_stamp_add_image.title=Lägg till bild
 editor_free_text2_aria_label=Textredigerare
 editor_ink2_aria_label=Ritredigerare
 editor_ink_canvas_aria_label=Användarskapad bild
+
+# Alt-text dialog
+# LOCALIZATION NOTE (editor_alt_text_button_label): Alternative text (alt text) helps
+# when people can't see the image.
+editor_alt_text_button_label=Alternativ text
+editor_alt_text_edit_button_label=Redigera alternativ text
+editor_alt_text_dialog_label=Välj ett alternativ
+editor_alt_text_dialog_description=Alt text (alternativ text) hjälper till när människor inte kan se bilden eller när den inte laddas.
+editor_alt_text_add_description_label=Lägg till en beskrivning
+editor_alt_text_add_description_description=Sikta på 1-2 meningar som beskriver ämnet, miljön eller handlingen.
+editor_alt_text_mark_decorative_label=Markera som dekorativ
+editor_alt_text_mark_decorative_description=Detta används för dekorativa bilder, som kanter eller vattenstämplar.
+editor_alt_text_cancel_button=Avbryt
+editor_alt_text_save_button=Spara
+editor_alt_text_decorative_tooltip=Märkt som dekorativ
+# This is a placeholder for the alt text input area
+editor_alt_text_textarea.placeholder=Till exempel, "En ung man sätter sig vid ett bord för att äta en måltid"
diff --git a/l10n/tg/viewer.properties b/l10n/tg/viewer.properties
index c9a41ac66..b00f700ed 100644
--- a/l10n/tg/viewer.properties
+++ b/l10n/tg/viewer.properties
@@ -246,9 +246,6 @@ editor_free_text2_label=Матн
 editor_ink2.title=Расмкашӣ
 editor_ink2_label=Расмкашӣ
 
-editor_stamp.title=Илова кардани тасвир
-editor_stamp_label=Илова кардани тасвир
-
 editor_stamp1.title=Илова ё таҳрир кардани тасвирҳо
 editor_stamp1_label=Илова ё таҳрир кардани тасвирҳо
 
@@ -268,3 +265,17 @@ editor_stamp_add_image.title=Илова кардани тасвир
 editor_free_text2_aria_label=Муҳаррири матн
 editor_ink2_aria_label=Муҳаррири расмкашӣ
 editor_ink_canvas_aria_label=Тасвири эҷодкардаи корбар
+
+# Alt-text dialog
+# LOCALIZATION NOTE (editor_alt_text_button_label): Alternative text (alt text) helps
+# when people can't see the image.
+editor_alt_text_button_label=Матни ивазкунанда
+editor_alt_text_edit_button_label=Таҳрир кардани матни ивазкунанда
+editor_alt_text_dialog_label=Имконеро интихоб намоед
+editor_alt_text_add_description_label=Илова кардани тавсиф
+editor_alt_text_mark_decorative_label=Гузоштан ҳамчун матни ороишӣ
+editor_alt_text_cancel_button=Бекор кардан
+editor_alt_text_save_button=Нигоҳ доштан
+editor_alt_text_decorative_tooltip=Ҳамчун матни ороишӣ гузошта шуд
+# This is a placeholder for the alt text input area
+editor_alt_text_textarea.placeholder=Барои мисол, «Ман забони тоҷикиро дӯст медорам»
diff --git a/l10n/tr/viewer.properties b/l10n/tr/viewer.properties
index f358aa239..eaa4eaba8 100644
--- a/l10n/tr/viewer.properties
+++ b/l10n/tr/viewer.properties
@@ -246,9 +246,6 @@ editor_free_text2_label=Metin
 editor_ink2.title=Çiz
 editor_ink2_label=Çiz
 
-editor_stamp.title=Resim ekle
-editor_stamp_label=Resim ekle
-
 editor_stamp1.title=Resim ekle veya düzenle
 editor_stamp1_label=Resim ekle veya düzenle
 
@@ -268,3 +265,19 @@ editor_stamp_add_image.title=Resim ekle
 editor_free_text2_aria_label=Metin düzenleyicisi
 editor_ink2_aria_label=Çizim düzenleyicisi
 editor_ink_canvas_aria_label=Kullanıcı tarafından oluşturulan resim
+
+# Alt-text dialog
+# LOCALIZATION NOTE (editor_alt_text_button_label): Alternative text (alt text) helps
+# when people can't see the image.
+editor_alt_text_button_label=Alternatif metin
+editor_alt_text_edit_button_label=Alternatif metni düzenle
+editor_alt_text_dialog_label=Bir seçenek seçin
+editor_alt_text_dialog_description=Alternatif metin, insanlar görseli göremediğinde veya görsel yüklenmediğinde işe yarar.
+editor_alt_text_add_description_label=Açıklama ekle
+editor_alt_text_mark_decorative_label=Dekoratif olarak işaretle
+editor_alt_text_mark_decorative_description=Kenarlıklar veya filigranlar gibi dekoratif görüntüler için kullanılır.
+editor_alt_text_cancel_button=Vazgeç
+editor_alt_text_save_button=Kaydet
+editor_alt_text_decorative_tooltip=Dekoratif olarak işaretlendi
+# This is a placeholder for the alt text input area
+editor_alt_text_textarea.placeholder=Örneğin, “Genç bir adam yemek yemek için masaya oturuyor”
diff --git a/l10n/uk/viewer.properties b/l10n/uk/viewer.properties
index d6ca7b27e..64864e05b 100644
--- a/l10n/uk/viewer.properties
+++ b/l10n/uk/viewer.properties
@@ -246,9 +246,6 @@ editor_free_text2_label=Текст
 editor_ink2.title=Малювати
 editor_ink2_label=Малювати
 
-editor_stamp.title=Додати зображення
-editor_stamp_label=Додати зображення
-
 editor_stamp1.title=Додати чи редагувати зображення
 editor_stamp1_label=Додати чи редагувати зображення
 
@@ -268,3 +265,20 @@ editor_stamp_add_image.title=Додати зображення
 editor_free_text2_aria_label=Текстовий редактор
 editor_ink2_aria_label=Графічний редактор
 editor_ink_canvas_aria_label=Зображення, створене користувачем
+
+# Alt-text dialog
+# LOCALIZATION NOTE (editor_alt_text_button_label): Alternative text (alt text) helps
+# when people can't see the image.
+editor_alt_text_button_label=Альтернативний текст
+editor_alt_text_edit_button_label=Змінити альтернативний текст
+editor_alt_text_dialog_label=Вибрати варіант
+editor_alt_text_dialog_description=Альтернативний текст допомагає, коли зображення не видно або коли воно не завантажується.
+editor_alt_text_add_description_label=Додати опис
+editor_alt_text_add_description_description=Намагайтеся створити 1-2 речення, які описують тему, обставини або дії.
+editor_alt_text_mark_decorative_label=Позначити декоративним
+editor_alt_text_mark_decorative_description=Використовується для декоративних зображень, наприклад рамок або водяних знаків.
+editor_alt_text_cancel_button=Скасувати
+editor_alt_text_save_button=Зберегти
+editor_alt_text_decorative_tooltip=Позначено декоративним
+# This is a placeholder for the alt text input area
+editor_alt_text_textarea.placeholder=Наприклад, “Молодий чоловік сідає за стіл їсти”
diff --git a/l10n/zh-CN/viewer.properties b/l10n/zh-CN/viewer.properties
index 4d9d7cc24..12908d190 100644
--- a/l10n/zh-CN/viewer.properties
+++ b/l10n/zh-CN/viewer.properties
@@ -246,9 +246,6 @@ editor_free_text2_label=文本
 editor_ink2.title=绘图
 editor_ink2_label=绘图
 
-editor_stamp.title=添加图像
-editor_stamp_label=添加图像
-
 editor_stamp1.title=添加或编辑图像
 editor_stamp1_label=添加或编辑图像
 
@@ -268,3 +265,20 @@ editor_stamp_add_image.title=添加图像
 editor_free_text2_aria_label=文本编辑器
 editor_ink2_aria_label=绘图编辑器
 editor_ink_canvas_aria_label=用户创建图像
+
+# Alt-text dialog
+# LOCALIZATION NOTE (editor_alt_text_button_label): Alternative text (alt text) helps
+# when people can't see the image.
+editor_alt_text_button_label=替换文字
+editor_alt_text_edit_button_label=编辑替换文字
+editor_alt_text_dialog_label=选择一个选项
+editor_alt_text_dialog_description=替换文字可在用户无法看到或加载图像时，描述其内容。
+editor_alt_text_add_description_label=添加描述
+editor_alt_text_add_description_description=描述主题、背景或动作，长度尽量控制在两句话内。
+editor_alt_text_mark_decorative_label=标记为装饰
+editor_alt_text_mark_decorative_description=用于装饰性图像，例如边框和水印。
+editor_alt_text_cancel_button=取消
+editor_alt_text_save_button=保存
+editor_alt_text_decorative_tooltip=已标记为装饰
+# This is a placeholder for the alt text input area
+editor_alt_text_textarea.placeholder=例如：一个少年坐到桌前，准备吃饭
diff --git a/l10n/zh-TW/viewer.properties b/l10n/zh-TW/viewer.properties
index 8fee7c770..56cf24c91 100644
--- a/l10n/zh-TW/viewer.properties
+++ b/l10n/zh-TW/viewer.properties
@@ -246,9 +246,6 @@ editor_free_text2_label=文字
 editor_ink2.title=繪圖
 editor_ink2_label=繪圖
 
-editor_stamp.title=新增圖片
-editor_stamp_label=新增圖片
-
 editor_stamp1.title=新增或編輯圖片
 editor_stamp1_label=新增或編輯圖片
 
@@ -268,3 +265,17 @@ editor_stamp_add_image.title=新增圖片
 editor_free_text2_aria_label=文本編輯器
 editor_ink2_aria_label=圖形編輯器
 editor_ink_canvas_aria_label=使用者建立的圖片
+
+# Alt-text dialog
+# LOCALIZATION NOTE (editor_alt_text_button_label): Alternative text (alt text) helps
+# when people can't see the image.
+editor_alt_text_button_label=替代文字
+editor_alt_text_edit_button_label=編輯替代文字
+editor_alt_text_dialog_label=挑選一種
+editor_alt_text_dialog_description=替代文字可協助盲人，或於圖片無法載入時提供說明。
+editor_alt_text_add_description_label=新增描述
+editor_alt_text_add_description_description=用 1-2 句文字描述主題、背景或動作。
+editor_alt_text_cancel_button=取消
+editor_alt_text_save_button=儲存
+# This is a placeholder for the alt text input area
+editor_alt_text_textarea.placeholder=例如：「有一位年輕男人坐在桌子前面吃飯」