diff --git a/l10n/de-DE/metadata.inc b/l10n/de/metadata.inc
similarity index 85%
rename from l10n/de-DE/metadata.inc
rename to l10n/de/metadata.inc
index f6e912942..d934291ef 100644
--- a/l10n/de-DE/metadata.inc
+++ b/l10n/de/metadata.inc
@@ -1,6 +1,6 @@
     <em:localized>
       <Description>
-        <em:locale>de-DE</em:locale>
+        <em:locale>de</em:locale>
         <em:name>PDF Viewer</em:name>
         <em:description>Nutzt HTML5 um PDFs direkt in Firefox anzuzeigen.</em:description>
       </Description>
diff --git a/l10n/de-DE/viewer.properties b/l10n/de/viewer.properties
similarity index 100%
rename from l10n/de-DE/viewer.properties
rename to l10n/de/viewer.properties