diff --git a/l10n/is/viewer.properties b/l10n/is/viewer.properties
index fdff9f814..58bd413c8 100644
--- a/l10n/is/viewer.properties
+++ b/l10n/is/viewer.properties
@@ -129,7 +129,7 @@ print_progress_close=Hætta við
 # 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=Víxla hliðslá
+toggle_sidebar.title=Víxla hliðarslá af/á
 toggle_sidebar_label=Víxla hliðslá
 document_outline.title=Sýna yfirlit skjals (tvísmelltu til að opna/loka öllum hlutum)
 document_outline_label=Efnisskipan skjals
@@ -140,6 +140,7 @@ thumbs_label=Smámyndir
 findbar.title=Leita í skjali
 findbar_label=Leita
 
+# LOCALIZATION NOTE (page_landmark): "{{page}}" will be replaced by the page number.
 # Thumbnails panel item (tooltip and alt text for images)
 # LOCALIZATION NOTE (thumb_page_title): "{{page}}" will be replaced by the page
 # number.
@@ -211,11 +212,15 @@ page_scale_actual=Raunstærð
 # numerical scale value.
 page_scale_percent={{scale}}%
 
+# Loading indicator messages
 loading_error=Villa kom upp við að hlaða inn PDF.
 invalid_file_error=Ógild eða skemmd PDF skrá.
 missing_file_error=Vantar PDF skrá.
 unexpected_response_error=Óvænt svar frá netþjóni.
 
+# LOCALIZATION NOTE (annotation_date_string): "{{date}}" and "{{time}}" will be
+# replaced by the modification date, and time, of the annotation.
+
 # 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).
diff --git a/l10n/szl/viewer.properties b/l10n/szl/viewer.properties
index 5980b6cc8..1af405d5b 100644
--- a/l10n/szl/viewer.properties
+++ b/l10n/szl/viewer.properties
@@ -189,7 +189,7 @@ find_match_count_limit[two]=Wiyncyj jak {{limit}}, co pasujōm
 find_match_count_limit[few]=Wiyncyj jak {{limit}}, co pasujōm
 find_match_count_limit[many]=Wiyncyj jak {{limit}}, co pasujōm
 find_match_count_limit[other]=Wiyncyj jak {{limit}}, co pasujōm
-find_not_found=Fraza niy ma znodniynto
+find_not_found=Fraza niy znaleziōno
 
 # Error panel labels
 error_more_info=Wiyncyj informacyji
@@ -242,5 +242,3 @@ password_cancel=Pociep
 printing_not_supported=Pozōr: Ta przeglōndarka niy cołkiym ôbsuguje durk.
 printing_not_ready=Pozōr: Tyn PDF niy ma za tela zaladowany do durku.
 web_fonts_disabled=Necowe fōnty sōm zastawiōne: niy idzie użyć wkludzōnych fōntōw PDF.
-# LOCALIZATION NOTE (unsupported_feature_signatures): Should contain the same
-# exact string as in the `chrome.properties` file.