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.

jest.config.js

@@ -14,7 +14,6 @@ const config = {
   collectCoverageFrom: [
     'app/javascript/mastodon/**/*.{js,jsx,ts,tsx}',
     '!app/javascript/mastodon/features/emoji/emoji_compressed.js',
-    '!app/javascript/mastodon/locales/locale-data/*.js',
     '!app/javascript/mastodon/service_worker/entry.js',
     '!app/javascript/mastodon/test_setup.js',
   ],