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.

app/models/form/admin_settings.rb

@@ -42,6 +42,7 @@ class Form::AdminSettings
     show_domain_blocks_rationale
     noindex
     outgoing_spoilers
+    require_invite_text
   ).freeze
 
   BOOLEAN_KEYS = %i(
@@ -62,6 +63,7 @@ class Form::AdminSettings
     trends
     trendable_by_default
     noindex
+    require_invite_text
   ).freeze
 
   UPLOAD_KEYS = %i(