While I know the unique language of the 40k universe helps keep player minds in the game and set the mood. I've a sever language problem and I often find myself stumbling over the pronunciations and even meanings of many of the words. Finding myself for example not only able to pronounce Arbitus but forgetting that they represent the police. As I've been running the game for close friends who are 1) great role players and 2) highly tolerant of my disability this hasn't proven too much of a problem, in many cases they have picked up on the language and use it while ignoring my slip ups.
Unfortunately fate has lead all the members of my group in different directions and I am left seeking new players. So I am forced to ask, what is the typical player's expectation of the adherence to the language of the 40k verse?