Yep, that's the one, Kristoffer.
"Chrzaszcz brzmi w trzcinie w Szczebrzeszynie."
This is the point where most English speakers ask for more vowels
Mystery solved! Jason Lutes handed over the almost-completed map to Bruce Geryk in order to fill in the location names (he was pressed for time). Turns out Mr. Geryk was born in Poland
Now to see if I can sneak a peek at the demo at work...