Update zh_CN.lang

I found that this file haven't been updated for a long time(serval months the last time). So I updated it. Add something that was lost and fix something.(The en_US.lang I contrasted is for mc 1.7.10) I'll keep translating new stuff in the future, thank u :D
Merge pull request #722 from Mrkwtkr/patch-1

Update zh_CN.lang