Hearthstone change language w/o redownload

[Kazaaa]

Edit C:\Hearthstone\client.config - change

[Localization]
Locale = enUS

to deDE / esES / esMX / frFR / itIT / koKR / plPL / ptBR / ruRU / zhCN / zhTW

Restart your client.

Edit:
deDE = german
esES = spanish
esMX = mexican (?)
frFR = french
itIT = italian
koKR = korean
plPL = polish
ptBR = brazilian portuguese
ruRU = russian
zhCN = chinese (traditional/simplified)
zhTW = taiwanese mandarin

[snow]

Works for OS X too.
/Applications/Hearthstone/client.config