Add translations for missing help tooltips

Added help tooltips for:

- condition
- loans
- object_addendum
- transcriptions
- provenance

Also added missing translations for data history.

backend/iw/provenance.json

@@ -10,6 +10,10 @@
         "final": "Finished",
         "creator": "Creator",
         "date": "Date",
-        "upload_document": "Upload a document"
+        "upload_document": "Upload a document",
+        "provenance_content_explica": "Text des (Provenienz-)Forschungsberichts.",
+        "provenance_status_explica": "Status of the research.",
+        "provenance_creator_explica": "Author(s) of the report.",
+        "provenance_date_explica": "Date of the report creation."
     }
 }