title: How to translate upload errors on CodeIgniter
body: <p>I am using CodeIgniter to upload some files through a form. I know how to translate "regular" form errors (required, valid_email, etc) but I don't know how to do it with file errors (file is not allowed, file is too big, etc). </p>
  
  <p>Which keys should I use in</p>
  
  <pre><code>$this-&gt;form_validation-&gt;set_message('KEY', 'TRANSLATION');
  </code></pre>
  
  <p>?</p>
  
  <p>Thanks</p>