Create zh_CN.lang

Awesome mod:P Though I have a question. Since we can get the potion liquid by bucket, why must we use the magic one? In fact, brewing in a magic way...um. That's a novel idea :D. Add this chinese localization. Hope can bring it to more people.
I also download another mod u coded: BotaniaVisualizer. If the mana reader can read the mana value of various flowers that will be more convenient.(Just a piece of advice)
Last but not least: ご苦労様