I was making Persian my custom language and so far, here are my results. For Who's on First, I found a way to make the text look normal on the module by inserting the partial characters in reverse order (e.g. ﻪﻟﺑ comes out as بله) but this messes up the outputted manual (it displays ﻪﻟﺑ). Passwords, the module shows the foreign characters in high-res, rather than being pixelated. I've yet to try Vent Gas and Big Button, though the latter seems easier.