add Chinese translation for basics2.textile and collections.textile
finish the translation, need to be refined.
fix 3 chinese translations and replace the code tag
fix zh_cn/type-basics.textile zh_cn/advanced-types.textile  and
zh_cn/coll2.textile; fix a error
url in coll2.textile
finish concurrency and java
finish finagle.textile
finish the searchbird's translation
fix several mistakes
fix the typo