title: FOSUser bundle check_path with localization
body: <p>How set login path with user locale? I tried</p>
  
  <blockquote>
    <p>check_path:     /{_locale}/login_check</p>
  </blockquote>
  
  <p>and</p>
  
  <pre><code>check_path:     /(en|ru)/login_check
  </code></pre>
  
  <p>but nothing ((</p>
  
  <p>Route config</p>
  
  <pre><code>fos_user_security:
      resource: "@FOSUserBundle/Resources/config/routing/security.xml"
      prefix:   /{_locale}
  </code></pre>
  
  <p>Exception:</p>
  
  <blockquote>
    <p>You must configure the check path to be handled by the firewall using
    form_login in your security firewall configuration.</p>
  </blockquote>