Merge branch 'feature/hidden_teams' into 'develop'

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

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

src/backoffice/templates/backoffice/teams/create_edit.html

src/backoffice/templates/backoffice/teams/detail.html

src/backoffice/templates/backoffice/teams/list.html

src/backoffice/tests/teams/members.py

src/backoffice/tests/teams/teams.py

src/backoffice/views/teams/teams.py

src/core/admin.py

src/core/forms/teams.py

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

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

...rations/0171_remove_team_require_staff_team_visibility.py

src/core/models/teams/teams.py