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

Conflicts:
- `app/javascript/mastodon/features/compose/components/compose_form.js`:
  Conflict caused because of minor code style change upstream, while glitch-soc
  has different code for handling variable maximum chars.
  Ported the change.
- `app/serializers/initial_state_serializer.rb`:
  Conflict because glitch-soc had two extra attributes where upstream added
  one.
  Added upstream's attribute.

app/javascript/mastodon/locales/defaultMessages.json

@@ -1257,6 +1257,23 @@
     ],
     "path": "app/javascript/mastodon/features/compose/components/emoji_picker_dropdown.json"
   },
+  {
+    "descriptors": [
+      {
+        "defaultMessage": "Change language",
+        "id": "compose.language.change"
+      },
+      {
+        "defaultMessage": "Search languages...",
+        "id": "compose.language.search"
+      },
+      {
+        "defaultMessage": "Clear",
+        "id": "emoji_button.clear"
+      }
+    ],
+    "path": "app/javascript/mastodon/features/compose/components/language_dropdown.json"
+  },
   {
     "descriptors": [
       {