Update chinese.js

中文字幕大修改，一名中国大陆人士看了NEM的翻译，惨不忍睹了有没有！初步修改翻译，请指正！
Chinese subtitle major modification！ One china mainland language based edition of Chinese translation of NEM client , lots of corrections made, please take it!
Merge pull request #188 from renolteng/patch-1

Update chinese.js