title: django blocktrans and i18n in templates
body: <p>I have an i18n problem in django:</p>
  
  <p>This works fine :  </p>
  
  <pre><code>{% trans cat.name %}  
  </code></pre>
  
  <p><code>cat.name</code> will be translated</p>
  
  <p>But this doesn't work:  </p>
  
  <pre><code>{% blocktrans with cat.name|slugify as cat_slug %}{{ cat_slug }}{% endblocktrans %}  
  </code></pre>
  
  <p><code>cat.name</code> is not translated</p>
  
  <p>If I change the filter :  </p>
  
  <pre><code>{% blocktrans with cat.name|capfirst as cat_slug %}{{ cat_slug }}{% endblocktrans %}  
  </code></pre>
  
  <p>I can see that the filter is working, but there is no translation...</p>