Merge branch 'release-3.0' into 'master'

.eslintrc.js

.gitlab-ci.yml

.prettierignore

CHANGELOG.rst

aleksis/apps/chronos/frontend/index.js

aleksis/apps/chronos/frontend/messages/de.json

aleksis/apps/chronos/frontend/messages/en.json

aleksis/apps/chronos/frontend/messages/ru.json

aleksis/apps/chronos/frontend/messages/uk.json

aleksis/apps/chronos/models.py

aleksis/apps/chronos/static/css/chronos/timetable.css

aleksis/apps/chronos/static/css/chronos/timetable_print.css

aleksis/apps/chronos/static/js/chronos/date_select.js

aleksis/apps/chronos/static/js/chronos/week_select.js

aleksis/apps/chronos/tests/test_notifications.py

aleksis/apps/chronos/util/build.py

docs/conf.py

fixtures/highschool-de-20212022.json

pyproject.toml

tox.ini