Approval in backend

backend/iw/data_history.json

@@ -93,6 +93,7 @@
         "link_place": "Linked a place",
         "link_time": "Linked a time",
         "categorization": "Categorization",
-        "measurement": "Measurement"
+        "measurement": "Measurement",
+        "open_versioning": "Open versioning"
     }
 }