Bob Marley (and UB40 from an earlier post in this sentence discussion) has been used in a couple sentences in the Music Skill. The computer randomly steals words from other places to create "wrong" sentence possabilities. It occasionally results in some pretty funny options.
The two are actually their letter sounds combined, in other words they're spelt how they sound. Let that be a guide.
A in the hawaiian alphabet makes an "ah" sound. I makes an "ee" sound. Put those together and say it quickly and A + I = "ah-ee" for ai or ‘ai.
E in the hawaiian alphabet makes an "eh" sound. (The sound in "wet" as opposed to the sound in "whey.") So A + E = "ah-eh" spoken quickly for ae or ‘ae.
They do sound very similar and the difference is subtle. I hope you get a chance to hear them next to each other. To my ear ’ai sounds sharper and ‘ae sounds flatter, but I don't know if that will mean much to you. When saying them, finish ‘ai with more of an ee sound, and finish ‘ae with more of an ay (like the name of the letter A) sound.
They should probably also accept that for this separate entry. Did you report it with the flag as, "my answer should have been accepted".
In any case, notice that there is no punctuation on this entry. This is not a sentence, this is just the word. If there had been a period or an exclamation mark, then this would have been the command and it would have required the "e". Like I said, though, it's easy to see this and think of the command, so I agree with you that it should be added as an accepted translation.