如何在iOS中将默认本地化语言设置为德语而不是英语？

I am trying to set default localization language to German. However , it is always showing text in English language. Can anyone guide me through proper steps to set the default language to German, so that no matter what language is selected in iPhone, it always displays text in German. I will be using German and french localization otherwise.I am trying to set default localization languag