I do not believe you can turn those off, yet it depends what age range the kids are, I am 12, and play it, because there's only like 5 curses in the game, and then the multiplayer has 100% clean language, and something you could say, don't say it's blood, say it's jelly.
Maybe you shouldn't play it at all. It IS rated M, after all.
However, no one ever seems to care about the rating, so you're probably in the clear to play.
But seriously, if you're offended by cussing and blood in video games, then don't play this because this is a war game, which means lots of killing.