Add translation variables for settings in backend and

institution-related pages in frontend

frontend/tr/museum.json

@@ -12,6 +12,7 @@
         "map_symbols": "Marker",
         "images": "Abbildungen",
         "page_museum_description": "\u00dcbersicht aller an dieser Instanz von museum-digital beteiligten Museen.",
-        "map_options": "Map options"
+        "map_options": "Map options",
+        "list_of_museums": "List of all museums"
     }
 }