Really? Apart from the Millenium Falcon being called "Rasender Falke" in Star Wars and "Millenium Falke" in Empire and Jedi (which is only a minor change), I never noticed any inconsitencies.
Also, the German version of Raiders of the Lost Ark was lately redubbed for the blu-ray and from what I heard, people aren't very happy with that. So I doubt that redubbing the whole Star Wars saga would turn out well.