[i18n] Improve translation: zh-cn

[myuki]

Changes proposed in this pull request:

• Review all zh-cn translation and improve.

Pull request checklist:

• clear commit messages
• code manually tested
• unit tests written (optional if too hard)
• documentation updated

Additional information can be found in the documentation.

[myuki]

I review all zh-cn translation, and found some weird string in en. Same thing has different expression in admin.php and install.php like:

'nok' => 'Cannot find JSON (php-json package).',

And

'nok' => 'Cannot find the recommended library to parse JSON.',

Also requiremented libraries has different name. Some prefix php- and some suffix package like (php-pcre),(PCRE), (ctype),(php-curl package).

Are those intentional or not?

[Alkarex]

Thanks!

Are those intentional or not?

No, this is not intentional, so feel free to make more uniform in your translations.

[myuki]

Thanks!

Are those intentional or not?

No, this is not intentional, so feel free to make more uniform in your translations.

Thanks for your reply. I may do some uniform for en, en-us and zh-cn in new PR.