Resolve "Add configurable username validator for signup"

Closes #664

See merge request !980

Update dependency django-phonenumber-field to v6

See merge request !774

Update dependency django-reversion to v5

See merge request !977

Fix typo

See merge request !979

[Docs] Fix redis address scheme

See merge request !978

Resolve "[AdditionalField] Allow setting `required` and `help_text`"

Closes #660

See merge request !976

Resolve "Feature: Account Menu in Top Navbar"

Closes #531

See merge request !907

# Conflicts:
#   CHANGELOG.rst

Resolve "Improve mobile design of login page"

Closes #572

See merge request !905

# Conflicts:
#   CHANGELOG.rst

Add retry button to 500 page

See merge request !972

Release 2.7.4

See merge request !969

Translations update from Weblate

See merge request !947

Currently translated at 100.0% (651 of 651 strings)

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

Update trans files

See merge request !968

Resolve "Allow more than one person without e-mail address to be invited"

Closes #652

See merge request !967

Merge branch '651-show-invitation-code-when-existing-person-without-email-is-invited-otherwise-show-that-email' into 'master'

Resolve "Show invitation code when existing person without email is invited, otherwise show that email was send"

Closes #651

See merge request !966

Resolve "Add invited person to invitation table"

Closes #650

See merge request !965

Fix invite permissions

See merge request !955

Disable check for existing person invitation with same e-mail address if person has no e-mail address

More cachalot fixes

See merge request !964