Fixes #1121, rename Post#annihilate to Post#expunge

config/routes.rb

@@ -16,10 +16,10 @@ Danbooru::Application.routes.draw do
       resource :queue, :only => [:show]
       resource :approval, :only => [:create]
       resource :disapproval, :only => [:create]
-      resources :posts, :only => [:delete, :undelete, :annihilate, :confirm_delete] do
+      resources :posts, :only => [:delete, :undelete, :expunge, :confirm_delete] do
         member do
           get :confirm_delete
-          post :annihilate
+          post :expunge
           post :delete
           post :undelete
         end