Activate WebAuthn and redesign 2FA profile page

See merge request !1099

Merge branch '785-verify-maintenance-mode-with-graphql-reimplement-maintenance-mode-handling' into 'master'

Resolve "Verify maintenance mode with GraphQL / reimplement maintenance mode handling"

Closes #785

See merge request !1154

Translations update from Weblate

See merge request !1175

Update translation files

See merge request !1182

Reformat

See merge request !1181

Set related name on site reference of ExtensibleModel to '+'

See merge request !1180

Use Django's session write-through cache

See merge request !971

# Conflicts:
#   CHANGELOG.rst

# Conflicts:
#   CHANGELOG.rst

Resolve "Add route permission for signup page"

Closes #793

See merge request !1168

Resolve "Twilio integration is broken due to the usage of wrong settings"

Closes #801

See merge request !1179

(cherry picked from commit 941e51cc)

Resolve "Add mechanism for apps to dynamically inject menu items"

Closes #797

See merge request !1172