AFAIK, no. Pretty pissed off myself, truth be telt. Here I am sitting in the Dora, talking in American English with my ground crew... the hell am I, an American defector or something?
PS / EDIT: But then again, who gives a crap. Not flying DCS anymore anyway myself, due to stuff being either overtly broken or unfinished. So never mind... and who needs German voices for immersion anyway, huh?