Closes #551.

Resolve "[Docker] startup script continues after failed migrations"

Closes #549

See merge request !795

Bump dev version to 2.3.dev0

See merge request !794

Prepare release 2.2

See merge request !793

Translations update from Weblate

See merge request !792

Currently translated at 100.0% (603 of 603 strings)

Translation: AlekSIS/AlekSIS-Core
Translate-URL: https://translate.edugit.org/projects/aleksis/aleksis-core/de/

Update translation files

See merge request !791

Support (icon) tabs in top navbar

See merge request !789

Merge branch '285-manage-permissions-for-persons-users-and-groups-django-groups-in-frontend' into 'master'

Resolve "Manage permissions for persons (users) and groups (Django groups) in frontend"

Closes #285

See merge request !533

Merge branch 'master' into 285-manage-permissions-for-persons-users-and-groups-django-groups-in-frontend

Set development version to 2.2.dev0

See merge request !788

Resolve "[Settings] Support config files in sub-directories"

Closes #548

See merge request !790

Resolve "Fix notifications on the dashboard"

Closes #540

See merge request !785

Resolve "Use @materializecss/materialize instead of materialize-css"

Closes #544

See merge request !786