Add translation variables for settings in backend and

institution-related pages in frontend

frontend/ru/museum.json

@@ -12,6 +12,7 @@
         "map_symbols": "Symbols",
         "images": "Images",
         "page_museum_description": "Overview of all museums participating on this instance of museum-digital.",
-        "map_options": "Map options"
+        "map_options": "Map options",
+        "list_of_museums": "List of all museums"
     }
 }