Hello,
i have idea in too make game more realistic, there should be used different language by different characters, if im not wrong all data are already in Steam version of game.
Afaik middle bohemian people were quite bilangular - they spoke czech and german very often, lots of characters has german - deutsch origin in the game, would be nice to game german voice over and english subtitles, even better would be if henry could use this voiceover too for conversation with them…
Istvan would probably use German too as Hungarian noble in Sigismund army and there are few npcs with polish origin too - at least i thing - Robber Baron.
After that game could teach you something…