Im in the Pre IB program, and I was told that I need 5 years of a foreign language. I already know Polish, do I need all 5 years?

I live and work in Poland and hence, it is easier to buy the Polish games. They all come with a little PL stucker indicating that they are the Polish language version. All I want to know is if this is an additional language setting or a complete overhaul of the game.
This question would apply to any foreign language version of an xbox game I imagine, so if you have experience using French, German or Spanish language versions, maybe you can help.