"Today the law says that to become a citizen, one must demonstrate command of English, yet for some reason we have Voting-Rights Act mandated foreign language ballots all over the nation. Why would that be necessary if we enforced the existing English requirements to immigration/naturalization law?"
Because this law mandates it on two years, not when, and if, they become citizens (which they won't be elibible for, for 17 years)
My point is that it won't be enforced, under any circumstances or any plan.