title: Retrieve active locale in Grails application
body: <p>I know I can use the "lang" parameter to automatically change the current locale as described in the <a href="http://grails.org/doc/latest/guide/10.%20Internationalization.html" rel="noreferrer">docs</a>, but how do I track those changes, for example to update the language stored in the current user domain object?</p>
  
  <p><code>request.locale</code> does not work, since it does not reflect the changes done via "<code>?lang=xx</code>"</p>