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

Conflicts:
- app/views/admin/pending_accounts/index.html.haml
  No real conflict, upstream changes too close to glitch-specific
  theming system changes.
- config/navigation.rb
  Upstream redesigned the settings navigation, took those changes
  and re-inserted the flavours menu.

config/routes.rb

@@ -217,10 +217,11 @@ Rails.application.routes.draw do
       end
     end
 
-    resources :pending_accounts, only: [:index, :update] do
+    resources :pending_accounts, only: [:index] do
       collection do
         post :approve_all
         post :reject_all
+        post :batch
       end
     end