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

Conflicts:
- `app/javascript/mastodon/locales/ja.json`:
  Upstream change too close to a glitch-soc-specific string.
  The glitch-soc-specific string should not have been in this file, so it
  has been moved to `app/javascript/flavours/glitch/locales/ja.js`.
- `app/javascript/packs/public.js`:
  Upstream refactored a part, that as usual is split and duplicated in various
  pack files. Updated those pack files accordingly.
- `app/views/layouts/application.html.haml`:
  Upstream fixed custom.css path in a different way than we did, went with
  upstream's change.

app/javascript/flavours/glitch/locales/ja.js

@@ -8,6 +8,7 @@ const messages = {
   'layout.single': 'モバイル',
   'navigation_bar.app_settings': 'アプリ設定',
   'navigation_bar.featured_users': '紹介しているアカウント',
+  'navigation_bar.misc': 'その他',
   'getting_started.onboarding': '解説を表示',
   'onboarding.page_one.federation': '{domain}はMastodonのインスタンスです。Mastodonとは、独立したサーバが連携して作るソーシャルネットワークです。これらのサーバーをインスタンスと呼びます。',
   'onboarding.page_one.welcome': '{domain}へようこそ！',