It's called "internationalization" so it's for worldly people, like Mara
Not a necessary disc, just as disc 2 isn't necessary either. But more programs, so why not?

Yeah, I think disc 3 is really rather than not necessary, but rather a space/bandwidth consumer

So if you are in the US and have no need for things like non-us characters, then no need to waste your time/bandwidth there.
Cool