There is a recent German release of these episodes in two boxsets: https://www.blu-ray.com/movies/Doctor-Who-Christopher-Eccleston-Der-komplette-Neunte-Doktor-Blu-ray/395208/ https://www.blu-ray.com/movies/Doctor-Who-David-Tennant-Der-komplette-Zehnte-Doktor-Blu-ray/395205/
I can't find much about them, although Amazon and a few online bluray stores I can find (I'm in Australia so not familiar with most EU or German distributors) lists them as having the German audio.