Bump version to 2.7.2 and update changelog

See merge request !946

Translations update from Weblate

See merge request !930

Currently translated at 99.8% (645 of 646 strings)

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

Update translation files

See merge request !945

Use separate database connection for Celery results

See merge request !943

This ensures Celery progress is always updated and queried outside a
transaction.

[Docker] Clear caches on migrate

See merge request !944

Rename PDF_CONTEXT_PROCESSORS

See merge request !942

Prepare release 2.7.1

See merge request !940

Resolve "get() returned more than one PersonPreferenceModel [Ticket#75959]"

Closes #633

See merge request !937

Merge remote-tracking branch 'origin/master' into 633-get-returned-more-than-one-personpreferencemodel-ticket-75959

More default schedules

See merge request !939

Update DOT to 1.7 and add background task

See merge request !938

# Conflicts:
#   CHANGELOG.rst

Resolve "After changing the user of a person, groups are not synced"

Closes #628

See merge request !935

Resolve "[PWA] Icon background/app background are red"

Closes #630

See merge request !934

Resolve "Use maskable icons"

Closes #543

See merge request !936