I have a little doubt

I'm not sure cause I haven't get my r4 yet , but I'm already downloading some Roms and when I downloaded Yu-Gi-Oh! 5D's stardust accelerator(U)... I saw some comments and found some things like the (U) version is in Japanese, or that all three versions are in English... so could anyone explain please? cause I don't get it.... since I got the (U) version just tell me if it is in English plz...

The U version is in English.The J version has English as a selectable language.

Try them out on an emulator. I know I did that a lot while I was waiting for my card to arrive in the mail. :)