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/helpers/languages_helper.rb

@@ -97,7 +97,7 @@ module LanguagesHelper
     lg: ['Ganda', 'Luganda'].freeze,
     li: ['Limburgish', 'Limburgs'].freeze,
     ln: ['Lingala', 'Lingála'].freeze,
-    lo: ['Lao', 'ພາສາ'].freeze,
+    lo: ['Lao', 'ລາວ'].freeze,
     lt: ['Lithuanian', 'lietuvių kalba'].freeze,
     lu: ['Luba-Katanga', 'Tshiluba'].freeze,
     lv: ['Latvian', 'latviešu valoda'].freeze,