Release 2.5

See merge request !858

Resolve "Problems with current version of Celery (5.2.0)"

Closes #542

See merge request !849

Translations update from Weblate

See merge request !857

[Docs] Fix development documentation

See merge request !855

Resolve "Add recursive helper methods for Group"

Closes #408

See merge request !852

Currently translated at 100.0% (622 of 622 strings)

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

Currently translated at 100.0% (604 of 604 strings)

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

Update translation files

See merge request !856

Resolve "OAuth2 broken in 2.4"

Closes #592

See merge request !854

#592

Add trademark to readme

See merge request !853

Resolve "PDF files offered for download despite of error"

Closes #590

See merge request !848

Merge branch '470-login-with-local-django-accounts-and-ldap-password-changes-are-mutually-exclusive' into 'master'

Resolve "Login with local Django accounts and LDAP password changes are mutually exclusive"

Closes #470

See merge request !847