German and a simple QWERTZ keyboard layout

Hi,

I received my Jolla phone today and was very happy with FingerTerm, but unsatisfied with the choice of layouts.

So I went ahead and made a German layout including umlauts (ä,ö,ü,ß) and some other reorganization, and a simple QWERTZ layout which only exchanges Z and Y from the english layout.

If you need any changes to include them, let me know. Happy to amend.

Thanks for your work!