Enable syncing all accounts in one click (#948)

* Enable syncing all accounts on one click

* Remove argument to sync_later method call

* Add partial for sync all accounts button

* Redirect back if possible when syncing all accounts

config/locales/views/accounts/en.yml

@@ -65,5 +65,8 @@ en:
       new: New account
     sync:
       success: Account sync started
+    sync_all:
+      no_accounts_to_sync: No accounts were eligible for syncing.
+      success: Successfully queued %{count} accounts for syncing.
     update:
       success: Account updated

config/routes.rb

@@ -63,6 +63,7 @@ Rails.application.routes.draw do
     collection do
       get :summary
       get :list
+      post :sync_all
     end
 
     member do