Then there's the language itself... would it be helpful for people who only speak Chinese to be able to program using Chinese words instead of "for", "map", "list", "if", "and", "let" and so on?
Waiters in Paris generally assume I'm an English-speaking tourist (a reasonable bet), and hand me the translated English menu. They mean well, but "Preserved Duck with Potatoes Fried in Duck Grease" doesn't sound anything like the delicious meal it usually is. I fear a translated programming language might have the same icky feel. And it would be a lot harder to share code if keywords were translated. But the tutorial ... yay.
I'm sure that Arc will always be better in the original. But to deny someone the pleasure of programming in Arc merely because they don't speak English seems... cruel :-)