zdenek, on git head, czech language is enabled with your translations included.
If the game starts in english, go to options/language to switch to czech.
Currently, you'll have to quit and restart the game to get the right encoding
(will be fixed later).
Currently, only the font used to display the menu contains the czech accentuated
chars (I'll soon fix the other fonts).

So, please, can you check and tell me if everything is right with the display of
the menu ?