Language skills seem a bit confusing still. Let me give the context, and then explain.
Previous editions had language with numeric skill ranks, like any other skill. One of the problems with that was that the numeric distinction of language skill ranks makes very little appreciable difference to gameplay.
In 6e, language has four discrete skill ranks, in line with how skills function: 'Ability to Use', Specialised, Expert, Native, in increasing order. All characters get one, and only one, Native language. (Functionally a Native language means you never have to make skill checks for that language, you automatically understand everything.) 'Ability to Use' means you possess that language (as opposed to if you didn't possess it, which would prevent you from understanding any of it). Higher ranks give bonuses to dice.
Finally, remember that Cityspeak is also a language, it is the language of the streets.