A free app for Android, by Marble Bloom.

Offline French German Wordbook is a free offline dictionary for your Android phone and tablet. You can access it anywhere, anytime, and it is available in the language you want.

This dictionary has a lot of words in the German and French languages. It also has the option to write the translation in the language of your choice.

You can search for the word you want to find and the results will be presented to you instantly. 

There is also the option to bookmark so that you can easily access the words you like the most.