Great! Thanks!
I downloaded the templates and it did the trick... Now I finally see that darn triggerboundingvolumes tag!
I didn't even had to change the regional settings...
The question remains, though - what was wrong with the old templates? I got them form this forum, from the post where the makers of the game first posted them...
Ah anyway, what matters is that I can finally work on the mod again! Many thanks for the help!