The team used the voices from the russian version of Company of Heroes, there are several mistakes as some tanks saying Sherman or Greyhound.
I assume you could take the Italian voices from the Italian version, but I'm not sure on how to, and I think the team asked relic if they could use the russian voices.
EDIT: Wow I saw your thread over at Relic, your models look really good! And you made BUILDINGS!
, shame you got banned.