Merge branch 'feature/wiki_lock_admin' into 'develop'

src/backoffice/locale/de/LC_MESSAGES/django.po

src/backoffice/locale/en/LC_MESSAGES/django.po

src/backoffice/templates/backoffice/wiki_lock_list.html

src/backoffice/urls.py

src/backoffice/views/wiki.py

src/core/admin.py

src/core/models/locks.py

src/hub/settings/base.py

src/plainui/tests/test_views.py

src/plainui/views/static_pages.py