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

Conflicts:
- `Gemfile.lock`:
  No real conflict, glitch-soc-only dependency (redcarpet) too close to an
  upstream one (rdf-normalize)
- `README.md`:
  we have different READMEs, discarded upstream's changes
- `app/views/admin/custom_emojis/index.html.haml`:
  No real conflict, different context because of glitch-soc theming
- `lib/mastodon/statuses_cli.rb`:
  Upstream added code to keep bookmarked statuses, we were already doing so
  with slightly different code. Discarded upstream's changes.
- `package.json`:
  No real conflict, glitch-soc-only dependency (favico.js) too close to
  an upstream one

app/javascript/mastodon/locales/defaultMessages.json

@@ -776,6 +776,10 @@
         "defaultMessage": "Bot",
         "id": "account.badges.bot"
       },
+      {
+        "defaultMessage": "Group",
+        "id": "account.badges.group"
+      },
       {
         "defaultMessage": "Toots",
         "id": "account.posts"
@@ -1035,6 +1039,14 @@
         "defaultMessage": "Poll duration",
         "id": "compose_form.poll.duration"
       },
+      {
+        "defaultMessage": "Change poll to allow multiple choices",
+        "id": "compose_form.poll.switch_to_multiple"
+      },
+      {
+        "defaultMessage": "Change poll to allow for a single choice",
+        "id": "compose_form.poll.switch_to_single"
+      },
       {
         "defaultMessage": "{number, plural, one {# minute} other {# minutes}}",
         "id": "intervals.full.minutes"