Remove obsolete translation files for nodac

There were folders for Portugese, Polish  and Italian translations,
which were never done

nodac/de/languser.json

@@ -16,6 +16,7 @@
         "preferred_language": "Bevorzugte Sprache",
         "admin": "Administrator",
         "groupadmin": "Gruppen-Administrator",
-        "editor": "Bearbeiter"
+        "editor": "Bearbeiter",
+        "switch_language": "Sprache wechseln"
     }
 }