Include necessary translations

aleksis/core/frontend/messages/en.json

@@ -75,7 +75,12 @@
     "back": "Back",
     "search": "Search",
     "edit": "Edit",
-    "close": "Close"
+    "close": "Close",
+    "cancel": "Cancel",
+    "confirm_deletion": "Are you sure you want to delete this item?",
+    "delete": "Delete",
+    "stop_editing": "Stop editing",
+    "save": "Save"
   },
   "administration": {
     "backend_admin": {