Each variant of a translation needs to be added manually, so if you report this using "my answer should have been accepted", they'll (probably) add it. It takes some time to go through, though. I find it best to stick with what they've already used, if I can remember, and not get too exciting :)
Habitatis is used for second person, plural, while habitas is for second person, singular. 'Ubi habitatis' means 'Where do y'all live', while 'Ubi tu habitas' or just 'Ubi habitas' means 'Where do you live', when you refer to 1 person only. The 'tu' in this sentence means 'you' and in Latin in can be skipped as the verb is already conjugated and tells who the subject is.