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

Use original language name plus code in selection menu

See merge request !1173

Update dependency django-cleanup to v7

See merge request !1176

Reformat

See merge request !1177

Resolve "Permission check in searchbar is broken"

Closes #796

See merge request !1171

Resolve "[OAuth] .well-known must be mounted under /"

Closes #606

See merge request !973

Merge branch '799-move-haystack-search-data-template-for-room-model-from-chronos-to-core' into 'master'

Resolve "Move haystack search data template for Room model from Chronos to Core"

Closes #799

See merge request !1174

Resolve "Changing the language doesn't affect the Django language"

Closes #783

See merge request !1163

Resolve "Error page broken in ObjectOverview"

Closes #794

See merge request !1169

Resolve "Sidenav button broken"

Closes #795

See merge request !1170