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

Conflicts:
- README.md
- app/javascript/styles/mastodon/components.scss
  conflicts caused by image URLs being different
- app/models/status.rb
  as_home_timeline removed, kept glitch-soc-only as_direct_timeline
- app/views/statuses/_simple_status.html.haml
- config/locales/en.yml
  some strings were changed upstream
- spec/models/status_spec.rb
  as_home_timeline removed, kept glitch-soc-only as_direct_timeline

app/models/form/admin_settings.rb

@@ -36,6 +36,7 @@ class Form::AdminSettings
     show_replies_in_public_timelines
     spam_check_enabled
     trends
+    trendable_by_default
     show_domain_blocks
     show_domain_blocks_rationale
     noindex
@@ -56,6 +57,7 @@ class Form::AdminSettings
     show_replies_in_public_timelines
     spam_check_enabled
     trends
+    trendable_by_default
     noindex
   ).freeze