[views] Use the relation widget on relations targeting an authority record

On the saemref demo with a few thousands of authority records, it's necessary
to have such 'lazy' widget.

views/archiveunit.py

@@ -911,10 +911,13 @@ for rtype, role in content_ordered_fields:
 
 pvs.tag_object_of(('*', 'seda_seq_alt_archive_unit_archive_unit_ref_id_management', '*'), 'hidden')
 
-affk.tag_subject_of(('SEDALanguage', 'seda_language_to', '*'),
-                    {'widget': rwdg.RelationFacetWidget})
-affk.tag_subject_of(('SEDADescriptionLanguage', 'seda_description_language_to', '*'),
-                    {'widget': rwdg.RelationFacetWidget})
+for rtype in ('seda_language_to', 'seda_description_language_to',
+              'seda_archival_agency', 'seda_transferring_agency',
+              'seda_originating_agency_to', 'seda_submission_agency_to',
+              'seda_authorized_agent_to',
+              'seda_writer_to', 'seda_addressee_to', 'seda_recipient_to'):
+    affk.tag_subject_of(('*', rtype, '*'),
+                        {'widget': rwdg.RelationFacetWidget})
 
 affk.set_fields_order(CONTENT_ETYPE,
                       ['user_cardinality', 'user_annotation'] + content_ordered_fields)