I have just purchased a phatbox and installed it on my mfd navigation system - everything works fine -except the static Voice in the menue... Everything is in english..
There are many tutorials in the web where they say that i can "easily" change the Menü-language with the multilanguage plugin from the phatnoise.com website - but the links provided by the tutorials are no longer available.. damn!

Where can i find those Plugin or how can force the phatbox to speak german with me ?

I believe that all of the official Phatnoise stuff disappeared once they stopped selling the Phatbox.
It is possible that someone here has a copy of the plugin and can help you.
If not, it should be possible to translate the most common voice prompts and generate new speech for them. One way would be to use the
demo server. Just select either the Klara or Reiner voice and enter the text you want spoken. It will give you a link to right-click on to download the file.