Add translation variables for new institution settings options

The next update will include new institution settings options for who
can comment on objects and the default sort order of objects of an
institutions when accessed from an institution or collection page.

backend/en/settings.json

@@ -51,6 +51,14 @@
         "elsewhere_link_url": "URL",
         "elsewhere_link_added": "Added link to other representations of the museum",
         "elsewhere_link_removed": "Removed link to other representations of the museum",
-        "metadata_rights": "Metadata rights:"
+        "metadata_rights": "Metadata rights:",
+        "obj_link_default_sort_by": "Link to objects: Default sort parameter",
+        "obj_link_default_sort_order": "Link to objects: Default sort order",
+        "comment_on_md_who": "Commenting on MD: Who can comment?",
+        "comments_by_all": "Everybody",
+        "comments_by_logged_in": "Any logged in users",
+        "comments_by_viewer": "Users with viewing rights",
+        "comments_by_editor": "Users with editing rights",
+        "comments_by_nobody": "Nobody"
     }
 }