title: django format_html not working with unicode
body: <p>I'm using the format_html(..) function in django. It fails when I'm using special characters like accents. Is there a way to use format_html(..) with special chars?</p>
  
  <p>The solution I've found is to:</p>
  
  <pre><code>format_html('&lt;label&gt;{0}&lt;/label&gt;', smart_text(classes).encode('ascii', 'ignore'))
  </code></pre>
  
  <p>But it only removes special chars.</p>