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

Conflicts:
- app/models/account.rb
- app/views/settings/profiles/show.html.haml
- spec/controllers/api/v1/accounts/credentials_controller_spec.rb

Conflicts were due to an increase in account bio length upstream, which
is already covered in glitch-soc through `MAX_BIO_CHARS`.

app/javascript/mastodon/locales/defaultMessages.json

@@ -2156,6 +2156,10 @@
   },
   {
     "descriptors": [
+      {
+        "defaultMessage": "Unboost",
+        "id": "status.cancel_reblog_private"
+      },
       {
         "defaultMessage": "Boost",
         "id": "status.reblog"