Update the translation more consistency, more natural Mandarin Chinese.

[Zhe Zhang]

For example, changed 'password' translation from 口令 to 密码。(try Google both of them, see the number of results, 密码 is more common used.)
Changed 'refresh' translation from 载入 to 刷新。
Also changed,
boolean -> 布尔值;
underline: 下横线 -> 下划线;
checkbox: 检查框 -> 复选框;
post: 张贴 -> 发表;
前导 -> 开始.

Fixed typo, and update some states' name.

[Zhe Zhang]

patchfile of locale/zh-CN/django.po

[Malcolm Tredinnick]

Added Liang Feng to the CC line. He's done a bunch of the recent zh_CN translation work, so I'd like the two of you to be mostly in agreement about the resulting file.

I won't apply this for now so that Liang has a chance to have a read, too.

[hutuworm]

I have read zhe's patch, and totally agree with him/her.

Thank you, zhe and mtredinnick.

Please apply it. :)

[Malcolm Tredinnick]

Well, that was certainly rapid feedback. :-)

[Malcolm Tredinnick]

(In [9059]) Fixed #8859 -- Some improvements to the Mandarin Chinese translation. Thanks, zhe.