Merge branch 'chore/backoffice-updates' into 'develop'

src/backoffice/forms/__init__.py

src/backoffice/forms/assemblies_team.py

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

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

src/backoffice/static/backoffice-no-script.css

src/backoffice/static/backoffice.css

...ce/templates/backoffice/assemblyteam_assembly_detail.html

...backoffice/templates/backoffice/assemblyteam_message.html

src/backoffice/templates/backoffice/base.html

...e/templates/backoffice/conferences/registration_edit.html

src/backoffice/templates/backoffice/map_poi_list.html

src/backoffice/views/assemblyteam.py

src/backoffice/views/conferences.py

src/backoffice/views/mixins.py

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

src/core/models/assemblies.py

src/core/tests/assemblies.py

src/core/views/list_views.py