Available language filenames
Use langeuage code with .json extention, eg: Russian => ru.json.
English and Chinese will always available, so you can use them as the template.

English:			en
Spanish:			es
French:			fr
German:			de
Russian:			ru
Portuguese:		pt
Japanese:		ja
Korean:			ko
Italian:			it
Turkish:			tr
Polish:			pl
Chinese:			zh-cn