Merge commit 'c8181eb0a41c4f5c1655d4e400cab071aee4182a' into glitch-soc/merge-upstream

Conflicts:
- `app/javascript/packs/admin.jsx`:
  Upstream reworked imports, but we had many changes.
  Reworked imports as upstream did.
- `app/javascript/packs/public.jsx`:
  Upstream reworked imports, but we had many changes.
  Reworked imports as upstream did.

app/javascript/mastodon/features/compose/components/compose_form.jsx

@@ -19,7 +19,7 @@ import LanguageDropdown from '../containers/language_dropdown_container';
 import ImmutablePureComponent from 'react-immutable-pure-component';
 import { length } from 'stringz';
 import { countableText } from '../util/counter';
-import Icon from 'mastodon/components/icon';
+import { Icon }  from 'mastodon/components/icon';
 import classNames from 'classnames';
 import { maxChars } from '../../../initial_state';