title: Flip layout on iPhone for RTL languages
body: <p>Here is my issue :</p>
  
  <p>I've localized my application in arabic. (It's actually slightly different than regular localization, as I have different targets, one for each language).</p>
  
  <p>On the simulator, the view is properly flipped, thanks to Auto-Layout and the leading / trailing part of the constraints, but I can't seem to get the same result on a device.
  <a href="https://stackoverflow.com/questions/18744447/autolayout-rtl-uilabel-text-alignment">AutoLayout + RTL + UILabel text alignment</a> shows an example of a flipped view on the simulator.</p>
  
  <p>I've also found indication that it is supported in the Auto-Layout Guide : « <a href="https://developer.apple.com/library/ios/documentation/userexperience/conceptual/AutolayoutPG/AutoLayoutConcepts/AutoLayoutConcepts.html#//apple_ref/doc/uid/TP40010853-CH14-SW1" rel="nofollow noreferrer">The attributes leading and trailing are the same as left and right for left-to-right languages such as
  English, but in a right-to-left environment such as Hebrew or Arabic, leading and trailing are the same as right and left</a> ». This lets me think that it is supposed to flip view, as it does on the simulator.</p>
  
  <p>I use <code>-AppleLanguages (ar_SA)</code> in my scheme on the simulator, which thus flips the view, but fail to find the proper setting in the device itself to do the same thing. Setting the language and Region Format to Arabic doesn't seem to help much.
  That is on an iPhone 4S, iOS 7.0.4</p>
  
  <p>TLDR: What setting should I change on an actual iPhone device to be in an « Arabic environment » and have a flipped view, or what am I missing so that it flips in the simulator but not on the device ?</p>