How do I change from English to my native language in Xcode? My whole system is in my preferred language, except Xcode. There's no use Googling "Xcode change language" or even "xcode change language -iphone -IDL -parse -Python -app -localization -internationalization -swift -objective-c", it only turns up developer questions.

How do I change the UI language for Xcode?
As Tom pointed out, XCode is only available in english on the Mac App Store ! 

If you look on other apps you'll see the available localizations for example on Apple's Number.