I know this won't be an issue with the month calendar template that I wrote at Wikipedia [1], but will this possibly break Trần Thế Trung's very complex Viet->IPA converter at Wiktionary [2]? It probably doesn't, but we should make sure: since Tim Starling isn't going to make this change for a few days, we have time to subst: the template if anything will get broken.
[1] http://vi.wikipedia.org/wiki/Ti%C3%AAu_b%E1%BA%A3n:L%E1%BB%8Bch_th%C3%A1ng_n... [2] http://vi.wiktionary.org/wiki/Ti%C3%AAu_b%E1%BA%A3n:VieIPA