Heres a link to the T999V rom if you want to try it. Its built from LH2 though, which is 4.1.2 I think. I dont know for sure if it has Polish, I just know it had a lot more than the T999 roms. Hope it helps.
XDA Developers was founded by developers, for developers. It is now a valuable resource for people who want to make the most of their mobile devices, from customizing the look and feel to adding new functionality. Are you a developer? | Terms of Service