[Q] Change language (locale) on per APP basis topic

Most apps take on the same language as the system language and there is usually no way of changing that unless there's an option in the app itself. However, on my KitKat Phone i could use the xposed module AppSettings and change “locale“ for every app to my liking.
I have an app that i want to be in german (its just not functional in english), but i dont want to change my 100 other apps and the whole system from english to german.

Anyone knows a way on Nexus 6/lollipop without xposed?

Any help is appreciated :)