What's written in the world of Gravity Rush

I've been playing Gravity Rush a lot recently (as you'll know if you follow me on Raptr) and enjoying the fantastic world that Kat gets to explore. But what's with all the stylised writing all over the place? That was one of many questions unresolved, but one player has spent some time investigating.

Figure out what's being said on the architecture and notices around the areas like Pleajeune and Auldnoir  in this handy article,