Unwanted Mod Missions

[StoneSpearman]

In Gipath,when i talk to Rivar the Hulk,there are some missions in Polish Language (Some of them: Wilki,Problem Hermita,...).I noticed them after playing with Wojak (and another guy),when they leave their game,i started to play myself.
I clicked on Rivar and there were some missions in Polish Language.I've chosen one in Polish Language.When i left the small village,EI crashed. Can someone tell me what mission pack is that?(I don't use any mods)
PS:Sorry for my bad english,i'm a Serb.
Edit: Those missions are by Miklosz and Jesik