You are not alone, but the only language I thought I've heard is during firefights, especially with fallen. I've heard "oh no!", and when they land a shot I've heard "excellent!". Of course, I might just be attributing language to regular sounds, but whatever. There's a chance there is something even more sinister going on: TINFOIL HATS GO ON NOW.... Bungie is using a well-known psychological model to create addiction to the game. That is indisputable, as recent articles comparing the game to a 'Skinner Box' have discussed. We are all being conditioned to play more and more. However, I don't think it is out of the realm of possibilities that there are also subliminal sounds being played in the game as well. Some of which crosses from subconscious to the conscious mind at times.