title: Find out the language of the user that filled in a form (Composite C1 forms renderer)
body: <p>We've got a form for a global datatype of our Composite C1 website that allows users to request a trial. This form is translated into German and English.
  Now what we would need is to know what language-version of this form the users used to submit their request, so that we can send the German reply-mail to all germans, and the Englich reply-mail to all the others.</p>
  
  <p>I would have thought of a hidden input element that is submitted along with the others. 
  Anyways it would be great if this information was stored along with the other input from the user in our datatype, like for a german user "de" and the others "en"</p>
  
  <p>Is there a way to achieve this using forms renderer? </p>