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

[IDoL]

As I see you`re talking about multiplayer game.
How do you know these missions authors?
If you have no mod installed then official nival`s quests only can be found in the game. Maybe it was patched version - if you use not a licence game.
Anyway I don`t think anybody at this site can help you with serbian(?) version of the game...

[Влесам]

It is standard EI bug.
When you play on another server and host player have some new quest, after this game you have it quest too. But they didn't work.

[StoneSpearman]

As I see you`re talking about multiplayer game.
How do you know these missions authors?
If you have no mod installed then official nival`s quests only can be found in the game. Maybe it was patched version - if you use not a licence game.
Anyway I don`t think anybody at this site can help you with serbian(?) version of the game...
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I have english version.
Authors - Simple.
Example: Mission (by Author)
or when you accept a mission:
Mission (by Author)