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/loans.json

@@ -46,6 +46,9 @@
         "all_loan_entries": "All loan entries",
         "must_be_numeric": "Must be a numeric value",
         "insurance_currency": "Insurance value: currency",
-        "loans_list_empty_text": "No loan entry has been added for your museum yet (hence, we cannot list any). You may:"
+        "loans_list_empty_text": "No loan entry has been added for your museum yet (hence, we cannot list any). You may:",
+        "loan_obj_remark_explica": "Note about the specific circumstances of the object as part of the loan.",
+        "select_loan_entry_explica": "Select the loan entry you want to link the object with from the list. If the loan entry has not been added before, you can add it by clicking on the \"+\" symbol.",
+        "partner_person": "Contact person"
     }
 }