Chapter 37: The Lost Prophecy

Simplified Chinese (Mandarin: China)
失落的预言 Shīluò de yùyán	失落 shīluò = 'to lose'. 的 de = connecting particle 预言 yùyán = 'prophecy'.	Lost prophecy
Traditional Chinese (Mandarin: Taiwan)
失去的預言 Shīqù de yùyán	失去 shī-qù = 'to lose, to forfeit'. 的 de = connecting particle 預言 yùyán = 'prophecy'.	Lost prophecy
Japanese
失われた予言 Ushinawareta yogen	失われた ushinawareta = 'was/be lost' (past tense of 失われる ushinawareru, passive form of 失う ushinau 'to lose'). 予言 yogen = 'prophecy'.	Lost prophecy
Korean
잃어버린 예언 Ilh-eobeolin yeeon	Pending
Vietnamese (Chinese characters show etymology)
Lời tiên tri đã mất	lời = 'word, utterance'. tiên tri (先知) = 'prophecy'. lời tiên tri together means 'prophecy'. đã = past tense marker mất = 'to lose'.	Lost prophecy
Mongolian (new)
Алдагдсан зөгнөл Aldagdsan zögnöl	Pending

A straightforward translation.

Similar titles are The Unexpected Task and (especially) The Lost Diadem.

(Detailed notes on the chapter can be found at Harry Potter Lexicon. The prophecy itself can be found at Madam Trelawney's first prediction.)