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

Conflicts:
- `app/controllers/application_controller.rb`:
  Conflict due to theming system.
- `app/controllers/oauth/authorizations_controller.rb`:
  Conflict due to theming system.

app/controllers/settings/base_controller.rb

@@ -3,6 +3,7 @@
 class Settings::BaseController < ApplicationController
   before_action :set_pack
   before_action :set_body_classes
+  before_action :set_cache_headers
 
   private
 
@@ -13,4 +14,8 @@ class Settings::BaseController < ApplicationController
   def set_body_classes
     @body_classes = 'admin'
   end
+
+  def set_cache_headers
+    response.headers['Cache-Control'] = 'no-cache, no-store, max-age=0, must-revalidate'
+  end
 end