Shouldn't you be able to edit the en_menu.txt to add in ( ) next to it the German text as well?
So for instance in data\menu edit en_menu.txt to change this:
810=Ship spotted, sir! Bearing %03d! %s range!
To this:
810=Ship spotted, sir! Bearing %03d! %s range! (Schiff gesichtet, Herr Kaleun! Richtung %03d! %s Entfernung!)
I don't know well the spacing would work, and it's a crap load of editing, but might get what you're looking for done.
Or switch to English voice and German text? That way you hear what they are saying, but see what it is in German.
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