Approval in backend

backend/kn/event.json

@@ -93,6 +93,9 @@
         "edit_event": "Edit the event",
         "clone_event": "Clone the event",
         "gnd": "Gemeinsame Normdatei",
-        "recognized_uncertainty": "Recognized uncertainty"
+        "recognized_uncertainty": "Recognized uncertainty",
+        "clone_without_actor": "Clone without actor",
+        "clone_without_place": "Clone without place",
+        "clone_without_time": "Clone without time"
     }
 }