Localize Chinese version

[noirgif]

Fixed some problems, made some improvements with the Chinese translation:

1. Throughout: mixed use of "you" -- the honorific 您 and the casual form 你. Now it sticks to the latter.
2. L71(first sentence), Chinese use 注释 instead of 评论 for comments in the code.
3. L71(second sentence), make the sentence clearer by changing the structure for the first half. And add a determiner "this" for the second half to make it clear what code is referred.
4. L74, the comments uses Chinese, which is a sign of "bad" code. Replaced it with the English version except for the link description, which is not a part of the code.
5. L86 & L93, stick to the native language rule.
6. L140, replaced 没有 with 不要 to show the imperative nature of it.
7. L140, appended a loose translation of "chill", which lit. means "no problem". The original misses it.
8. L164, localized translation of "extensively". The original translation of it has a subtle difference from the idea "as much as possible".
9. L274, localized the "nest" pun with 缩进(lit. indent) pun. The original one is not a joke.
10. L351, translated "stick to the past" with an idiom which means exactly the same.
11. L380, minor changes because 不需要 is rarely used as an attributive.
12. L384, which lit. translates to "write the code you want". Replaced it with a phrase that translates to "write the code however you want".