Resolve ""Edit group type" form shows "CSV import reference" field"

Closes #631

See merge request !933

Resolve "PDF generation broken with S3 storage"

Closes #629

See merge request !931

Update dependency django-cleanup to v6

See merge request !932

Works around an issue with boto3:

  https://github.com/jschneier/django-storages/issues/708

Prepare release 2.7

See merge request !929

Translations update from Weblate

See merge request !909

Currently translated at 100.0% (645 of 645 strings)

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

Update translation files

See merge request !928

Add missing permission

See merge request !925

Resolve "Missing permission for user invitations"

Closes #627

See merge request !923

Resolve "Cleave.js integration probably broken"

Closes #626

See merge request !924

Resolve "Date select doesn't use initial value from field [Ticket#75918]"

Closes #624

See merge request !921

Resolve "KeyError when editing person as non-admin"

Closes #619

See merge request !915

Resolve "Break too long headlines"

Closes #530

See merge request !906

Merge branch '623-status-page-throws-internal-server-error-if-backup-directory-not-found' into 'master'

Resolve "Status page throws internal server error if backup directory not found"

Closes #623

See merge request !920

Resolve "Pre-define periodic tasks"

Closes #602

See merge request !919

Resolve "[Docs] Document dashboard and dashboard widgets"

Closes #616

See merge request !918

Update dependency ipython to v8

See merge request !908