So in case someone buys a laser printer from Canon (don't!) maybe this will save you a lot of hassle.
That's a pretty sad tale. My guess is that Canon has decided that Apple's rule that there can be only
one driver for the whole world for each printer (with language modules that switch automatically) is just too, uh, logical for them.
I bought a Brother laser myself and my experience installing that was pretty much the polar opposite of yours. After inserting the disc, the first question on the screen was "Japanese or English?" (It auto-detected Mac.)
It's been trouble-free for about five years now and works like a charm.
Obviously, Brother is trying harder than Canon.
Jimmie