Merge branch 'redmine-issues/26377' into 'develop'

README.md

api/serializers/__init__.py

api/serializers/user.py

api/tests/data/test_list_customfields.json

api/urls.py

api/views/user.py

geocontrib/admin/user.py

geocontrib/choices.py

geocontrib/data/usersgroups_notificationmodel.json

geocontrib/emails.py

.../0058_usersgroup_alter_customfield_field_type_and_more.py

...ontrib/migrations/0059_load_new_data_usersgroups_notif.py

geocontrib/models/__init__.py

geocontrib/models/annotation.py

geocontrib/models/user.py

geocontrib/signals.py

...eocontrib/email/notif_users_groups_published_feature.html

geocontrib/templatetags/app_filters.py

notifications.md