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

# Conflicts:
#   CHANGELOG.rst

Explicitly set required to True for required prefs

Closes #612

See merge request !917

Resolve "Clearing theme colours breaks SCSS compilation"

Closes #612

See merge request !916

Resolve "[S3] Upload of icons still fails"

Closes #621

See merge request !914

Get file object from preferences instead from signal for generating favicons after preference change

Show home and mobile phone numbers

See merge request !913

Resolve "Phone number in person detail not properly linked"

Closes #618

See merge request !912

Resolve "[Signup] Permission denied also if signup is enabled"

Closes #615

See merge request !911

Do release 2.6

See merge request !904