Merge branch 'master' into glitch-soc/merge-upstream

Conflicts:
- `app/serializers/rest/account_serializer.rb`:
  Upstream added code too close to glitch-soc-specific followers-hiding code.
  Ported upstream changes.

app/helpers/settings_helper.rb

@@ -36,6 +36,7 @@ module SettingsHelper
     it: 'Italiano',
     ja: '日本語',
     ka: 'ქართული',
+    kab: 'Taqbaylit',
     kk: 'Қазақша',
     kn: 'ಕನ್ನಡ',
     ko: '한국어',