Merge branch 'master' into glitch-soc/merge-upstream
Conflicts:
- `app/controllers/concerns/sign_in_token_authentication_concern.rb`:
Conflict due to glitch-soc's theming system.
Ported upstream changes.
- `app/controllers/concerns/two_factor_authentication_concern.rb`:
Conflict due to glitch-soc's theming system.
Ported upstream changes.