Hi, I'm native german and have been working as a translator for 6 1/2 years.
I have few ratings here on freelancer, but have a look at them. So far everyone was satisfied with my work, which is my highest priority! (I had also some app translations so far).
I have two android phones for testing: a HTC Desire S (Android 4.4) and a Wiko Highway (4.2).
If interested get inn touch with me...
Regards, Tino Frendik