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

Conflicts:
- `app/models/form/admin_settings.rb`:
  New setting added upstream. Ported it.
- `app/views/statuses/_simple_status.html.haml`:
  Upstream removed RTL classes. Did the same.
- `config/settings.yml`:
  New setting added upstream. Ported it.

config/settings.yml

@@ -79,6 +79,7 @@ defaults: &defaults
   show_domain_blocks: 'disabled'
   show_domain_blocks_rationale: 'disabled'
   outgoing_spoilers: ''
+  require_invite_text: false
 
 development:
   <<: *defaults