title: translation of many xib files
body: <p>i've ultimated a project in objective c, the problem is that i've more than 10 XIB files, each one with many label, button ecc.</p>
  
  <p>I'm developing in German, i wish to make a English version, how can i do this in a simple and efficiente way? All with NSLocalizableString? I want avoid to duplicate each xib if possible.</p>
  
  <p>Thanks for any advice.</p>