Merge commit 'a27bafa59653328a0f06bedb1dfb2b6ee92af43d' into glitch-soc/merge-upstream

- `app/controllers/application_controller.rb`:
  Minor conflict due to glitch-soc's theming system.
- `spec/helpers/application_helper_spec.rb`:
  Minor conflict due to glitch-soc's theming system.

app/views/settings/preferences/appearance/show.html.haml

@@ -18,6 +18,7 @@
       = f.input :time_zone,
                 collection: ActiveSupport::TimeZone.all.map { |tz| ["(GMT#{tz.formatted_offset}) #{tz.name}", tz.tzinfo.name] },
                 hint: false,
+                selected: current_user.time_zone || Time.zone.tzinfo.name,
                 wrapper: :with_label
 
   - unless I18n.locale == :en