title: base.html contains {% extends 'base.html' %}?
body: <p>I'm trying the django-cms tutorial,
  There is something I don't understand <a href="http://docs.django-cms.org/en/support-3.0.x/introduction/plugins.html#install-the-polls-app" rel="nofollow">at the end of this part</a> :</p>
  
  <p>I have to add a template at <strong>/mysite/templates/polls/base.html</strong>. But this file has to begin with <code>{% extends 'base.html' %}</code>.
  Is that normal? Is the file this line refers to an other <strong>base.html</strong> file? The one in the parent directory perhaps? I'm not sure at all.</p>
  
  <p>Thank you for your help.</p>