The best way to proofread material is to read it out loud, and with the fakest accent you can muster. You will find so many more errors and cumbersome phrases that way. Or, at least I do...
I don't think the label is enough, it needs to be more explicit, tell you exactly how and where it was used in the game.
It also needs to be visible on boot up, along with the "Made/Presented with" game engine logos before the game starts.
Customers deserve transparency.