Merge commit 'b0780cfeeda641645ea65da257a72ec507e71647' into glitch-soc/merge-upstream

Conflicts:
- `app/javascript/mastodon/load_locale.js`:
  The file moved to `app/javascript/mastodon/locales/load_locale.ts`.
  Ported the changes there and deleted `app/javascript/mastodon/load_locale.js`.
- `app/javascript/mastodon/locales/index.js`:
  The file moved to `app/javascript/mastodon/locales/index.ts`.
  Did *not* port the changes as I want to try something a bit different.

app/helpers/react_component_helper.rb

@@ -11,7 +11,7 @@ module ReactComponentHelper
   end
 
   def react_admin_component(name, props = {})
-    data = { 'admin-component': name.to_s.camelcase, props: Oj.dump({ locale: I18n.locale }.merge(props)) }
+    data = { 'admin-component': name.to_s.camelcase, props: Oj.dump(props) }
     div_tag_with_data(data)
   end