Add translations for missing help tooltips

Added help tooltips for:

- condition
- loans
- object_addendum
- transcriptions
- provenance

Also added missing translations for data history.

backend/ar/data_history.json

@@ -19,6 +19,12 @@
         "visibility": "Visibility",
         "type_of_edit": "Changed ...",
         "date": "at",
-        "user": "by"
+        "user": "by",
+        "transcription": "Transcription",
+        "restorationReport": "Restoration report",
+        "exhibition": "Exhibition",
+        "loan": "Loan",
+        "provenance": "Provenance report",
+        "image": "Abbildung"
     }
 }