(ITS SPELT WITH A Q DAMMIT !!!!)
I let that pass as soon as I saw it, because I figure it's done that way for the same reason that Romulans were bald with facial tattoos in the previous film. The thought being that if you don't spell "Qu'Onos" the way it sounds, then the general audience (i.e. non-Trekkies) won't get it. Just like making the Romulans distinguishable in appearance from Vulcans allows you to skip a certain amount of exposition about the shared history of the two races and just get on with the parts of the story that are directly connected to the story you're trying to tell.
Not that I completely agree with either decision, but I've seen Trek
film screenwriters commit worse offenses, and I can at least rationalize these choices.