Add appeals (#17364)

* Add appeals

* Add ability to reject appeals and ability to browse pending appeals in admin UI

* Add strikes to account page in settings

* Various fixes and improvements

- Add separate notification setting for appeals, separate from reports
- Fix style of links in report/strike header
- Change approving an appeal to not restore statuses (due to federation complexities)
- Change style of successfully appealed strikes on account settings page
- Change account settings page to only show unappealed or recently appealed strikes

* Change appealed_at to overruled_at

* Fix missing method error

config/routes.rb

@@ -164,6 +164,12 @@ Rails.application.routes.draw do
     resources :login_activities, only: [:index]
   end
 
+  namespace :disputes do
+    resources :strikes, only: [:show] do
+      resource :appeal, only: [:create]
+    end
+  end
+
   resources :media, only: [:show] do
     get :player
   end
@@ -324,6 +330,15 @@ Rails.application.routes.draw do
         end
       end
     end
+
+    namespace :disputes do
+      resources :appeals, only: [:index] do
+        member do
+          post :approve
+          post :reject
+        end
+      end
+    end
   end
 
   get '/admin', to: redirect('/admin/dashboard', status: 302)