Merge branch 'submission_form' into 'master'

AKModel/locale/de_DE/LC_MESSAGES/django.po

AKModel/migrations/0016_slot_room_blank.py

AKModel/migrations/0017_owner_slug.py

AKModel/migrations/0018_merge_20191023_2227.py

AKModel/migrations/0019_slot_start_optional.py

AKModel/migrations/0020_ak_unique.py

AKModel/migrations/0021_base_url.py

AKModel/models.py

AKModel/views.py

AKSubmission/forms.py

AKSubmission/locale/de_DE/LC_MESSAGES/django.po

AKSubmission/templates/AKSubmission/ak_detail.html

AKSubmission/templates/AKSubmission/ak_edit.html

AKSubmission/templates/AKSubmission/ak_list_table.html

...mission/templates/AKSubmission/akowner_create_update.html

AKSubmission/templates/AKSubmission/messages.html

AKSubmission/templates/AKSubmission/submission_overview.html

AKSubmission/templates/AKSubmission/submit_new.html

AKSubmission/templates/AKSubmission/submit_new_wish.html

AKSubmission/templatetags/tags_AKSubmission.py