Something I once read is that different cats don't seem to use exactly the same noise to mean the same thing, ie, one cat might use a certain sort of meow to show that it is hungry, but another cat might use a similar meow to show that they want attention. Further, that wild cats usually stop making many such noises after they grow up, but domestic ones keep using them to communicate with people. If this is true, then the cat noises don't really represent a cat language as such since each individual cat would have it's own different set of vocabulary it develops in an attempt to get humans to understand it, being forced to resort to being all dramatic and acting like a kitten to get their message across because humans are sometimes too clueless to understand their body language.