Which is the correct Kiswahili? sw or swa?

[benjaoming]

Related to: #30

Could sw or swa be encoded somewhere as the mandatory choice, failing if the wrong one is used?

Could be consolidated here? https://github.com/learningequality/sushi-chef-khan-academy/blob/master/constants.py

[benjaoming]

Because of https://sw.khanacademy.org/ I'd go with sw -- would that be the preferred one in Studio as well?