Approval.

nodac/en/sources.json

@@ -69,6 +69,12 @@
         "unite_titel": "Merge sources",
         "unite_with": "Merge with",
         "unite_first": "Merge two entries. Please select first entry.",
-        "unite_second": "Merge two entries. Please select second entry."
+        "unite_second": "Merge two entries. Please select second entry.",
+        "editor": "Editor",
+        "editor_explica": "Editor or editors of this work. Type in and select an editor from the list. If none can be found, you can add a new one by clicking on the \"+\"-button in front of the text field.",
+        "booktitle": "Book title",
+        "booktitle_explica": "The book a chapter was published in.",
+        "isbn": "ISBN",
+        "isbn_explica": "ISBN of the book. Should be left empty for books published without an ISBN."
     }
-}
+}