So...I'll clear the situation
KBMaster is a mod for modders. It allows to make replaces or to sdd lines to core .lua files. So if one mod uses arena.lua and another one does the same they were not compatible with each other. Now this problem is solved by KBM (thanks to NyRe, tav and others).
But the mods need to be designed specially for KBM to work together.
If someone needs to know how does it work..I'll describe
P.S. It also contains interface mod (eng_translation is comming this night
)