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

Conflicts:
- `app/javascript/mastodon/features/compose/components/poll_form.js`:
  Upstream bumped poll option character limit, but we already had
  a higher one, kept ours.
- `app/validators/poll_validator.rb`:
  Upstream bumped poll option character limit, but we already had
  a higher one, kept ours.
- `config/initializers/content_security_policy.rb`:
  Upstream added a rule, the way we compute ours is different, but
  that added rule has been ported.
- `package.json`:
  No real conflict, dependency update. Performed the same update.
- `yarn.lock`:
  No real conflict, dependency update. Performed the same update.

config/locales/en.yml

@@ -1093,6 +1093,8 @@ en:
     disallowed_hashtags:
       one: 'contained a disallowed hashtag: %{tags}'
       other: 'contained the disallowed hashtags: %{tags}'
+    errors:
+      in_reply_not_found: The status you are trying to reply to does not appear to exist.
     language_detection: Automatically detect language
     open_in_web: Open in web
     over_character_limit: character limit of %{max} exceeded