Merge remote-tracking branch 'origin/master' into gs-master

Conflicts:
 	app/serializers/initial_state_serializer.rb

The glitch flavour isn't yet pulling custom emoji data on its own (see
https://github.com/tootsuite/mastodon/pull/7047).  Once that gets into
the glitch flavour, we can eliminate the custom_emojis load.

app/javascript/mastodon/locales/defaultMessages.json

@@ -1730,6 +1730,10 @@
         "defaultMessage": "Notifications",
         "id": "tabs_bar.notifications"
       },
+      {
+        "defaultMessage": "Search",
+        "id": "tabs_bar.search"
+      },
       {
         "defaultMessage": "Local",
         "id": "tabs_bar.local_timeline"