title: Localize Done button of MPMoviePlayerViewController
body: <p>I am using a MPMoviePlayerViewController to present videos. Everything works as expected, but if I switch the device's language to e.g. German, the "Done" button is not localized.</p>
  
  <p>I tried to access the button and set it to my own button implementation like so:</p>
  
  <pre><code>MPMoviePlayerViewController *mp = [[MPMoviePlayerViewController alloc] initWithContentURL:url];
  
  NSLog(@"%@", mp.navigationItem.leftBarButtonItem); // always null, but why?
  
  // override button with locale 
  mp.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Zurück"
                                               style:UIBarButtonItemStyleDone 
                                               target:self 
                                               action:@selector(dismissMoviePlayer:)];
  
  [self presentMoviePlayerViewControllerAnimated:mp];
  </code></pre>
  
  <p>A similar question has been asked before, but never received any answers: <a href="https://stackoverflow.com/questions/7746051/objective-c-mpmovieplayerviewcontroller-done-button-language">objective-c MPMoviePlayerViewController done button language</a>.</p>
  
  <p>Thanks for your help.</p>