Found something that can be done about the voice, I don't know if we're not supposed to do this, but you can go into the files for the original Lock On. The Betty voices are at:
Lock On\Sounds\Computer\GER\
Copy those sound files to a location you'll make in the DCS World folder
DCS World\Sounds\Speech\Sound\GER\Common\Betty\Messages
Finally, enjoy the German voice in your German MiG