Both carols10cents and I, the primary authors, are reading this thread. Happy to answer any questions other than "when will it be done," as estimations are hard ;)
Yes we are! There's someone working on Vietnamese [1]. It's a bit blocked on mdbook support [2], but the translation part could start before that's done. Chapters 2, 3, 4, and 6 are effectively "frozen" for print at this point [3] so they'd be the place I'd recommend starting first!