Merge commit '9974163776b3e65e7cfa41e6293876909a1635b7' into glitch-soc/merge-upstream

Conflicts:
- `app/views/layouts/admin.html.haml`:
  Upstream moved `javascript_pack_tag` calls around, but we don't use them in
  the same way in glitch-soc due to the different theming system.
  Kept glitch-soc's files unchanged.