title: Change locale for django-admin-tools
body: <p>In my <code>settings.py</code> file I have:</p>
  
  <pre><code>LANGUAGE_CODE = 'ru-RU'
  </code></pre>
  
  <p>also, I have installed and working django-admin-tools. But admin language still english. What I'm doing wrong?</p>
  
  <p>PS.</p>
  
  <pre><code>$ cat settings.py | grep USE | grep -v USER
  USE_I18N = True
  USE_L10N = True
  USE_TZ = True
  </code></pre>