I get what you guys mean, but as @legress said, it is only realistic to have German voices in the Germany map. Should we, for example, add France to the game, then off course we would have French voices, etc.
We don't have the resources though to record voices in all languages that the game is available in. We would have to hire professional speakers in every language for a huge set of words and sentences, which takes up a tremendous amount of time and is just simply way too expensive.
So keep your hopes down, that's just not going to happen for now.