Chapter 31: The Battle of Hogwarts

Simplified Chinese (Mandarin: China)
霍格沃茨的战斗 Huògéwòcí de zhàndòu	霍格沃茨 Huògéwòcí = 'Hogwarts'. 的 de = connecting particle 战斗 zhàndòu = 'battle'.	The battle of Hogwarts
Traditional Chinese (Mandarin: Taiwan)
霍格華茲大戰 Huògéhuázī dà-zhàn	霍格華茲 Huògéhuázī = 'Hogwarts'. 大戰 dà-zhàn = 'great battle'.	The great battle of Hogwarts
Japanese
ホグワーツの戦い	ホグワーツ Hoguwātsu = 'Hogwarts'. の no = connecting particle 戦い tatakai = 'battle, fight'.	The battle of Hogwarts
Vietnamese (Chinese characters show etymology)
Chiến trường Hogwarts	chiến trường (戰場) = 'battlefield'. Hogwarts = 'Hogwarts'.	The Hogwarts battlefield

All use slightly different words to translate 'battle'.

The Mainland Chinese translator uses 战斗 zhàndòu, meaning 'battle' or 'struggle'.
The Chinese translator from Taiwan uses the word 大戰 dà-zhàn, literally 'great battle'. This is a single word made up of 大 dà 'big' and 戰 zhàn 'battle, fight'.
The Vietnamese translation uses chiến trường meaning 'battle field'. Using Chinese characters this would be written 戰場 ('battle' + 'place'), and is a word used in both Chinese and Japanese.
Japanese uses the native word tatakai 'fight, battle', which is written using the same Chinese character 戦. Hiragana い i indicates that this is to be read tatakai, a noun derived from the verb 戦う tatakau 'to fight, battle with'.

(Detailed notes on the chapter can be found at Harry Potter Lexicon)