Wow. I've never seen so many people start ripping on someone's idea so quickly. Narin has the right idea, people. Explain what is wrong with the idea and how it isn't possible, don't just say "LOL OMGEE HE IS DUM", or "lol wut a tard". Lets all be a bit mature, here, shall we?
Narin pretty much summed it up. Nintendo may very well have allowed you to release this "translated" version. However, because Anime wasn't mainstream in America for a long time, different companies have picked up the licenses to the Shoen Jump characters. If all the Shoen Jump characters were owned by, say, Shoen Jump America, then if you had their permission you could definitely have released this, and Nintendo probably already would have. All the companies who own Shoen Jump characters would never agree to do this, unless you had a hell of a lot of cash to buy all the licenses and put them under one banner.
All of this is irrelevant, though, due to the fact that a DS cartridge is made of ROM and not able to be written to.
I hate to see someone get attacked for a question or idea. Lets all settle down, please.