My app has been localized to German and Korean only. To view the translated text, set your default language for your iOS in the Settings app. I Don't have immediate plans on creating more localized versions, but Japanese and Chinese would be next on my list.
If you have your iOS set to German or Korean, you can force English text using the option "Force English" in Global Options > Other. Otherwise, no, you can't set the language to something else. Sorry, my last post didn't seem to be a good answer.
Hi!! Thanks for the explanation. You can delete my new post regarding changing the language. I'll try it out (cause the app is downloaded in Russia in EN and should work in German)