Hi OleSSio and welcome to the Forum!
I am so glad to hear that you are enjoying LR curriculum. At the moment German curriculum not in the development stages, I am sorry if that is a disappointment. But the good news is that there are a fair number of German lessons in our library
http://library.brillkids.com/library.php?cid=1&lid=12 -- you can download these and use them in your Little Reader.
You can also customize your Little Reader lessons and make your own German lessons. Let us know if you have more questions about that and we will direct you to the how to articles about that! I know many parents creating lessons in their own languages. If you do so, don't forget to share them with others by uploading them into the library
It is wonderful to have such an international community here! Let us know if we can help with anything.