Update zh_cn.po

[TC999]

Add some word and fix translate error

补全文件

Thanks for taking the time to contribute to Git! Please be advised that the
Git community does not use github.com for their contributions. Instead, we use
a mailing list ([email protected]) for code submissions, code reviews, and
bug reports. Nevertheless, you can use GitGitGadget (https://gitgitgadget.github.io/)
to conveniently send your Pull Requests commits to our mailing list.

For a single-commit pull request, please leave the pull request description
empty: your commit message itself should describe your changes.

Please read the "guidelines for contributing" linked above!

[github-actions]

Errors and warnings found by git-po-helper in workflow #826:

INFO no missing blobs of po/* in partial clone    
------------------------------------------------------------------------------
ERROR commit 1eeab31: found changes beyond "po/" directory: 
ERROR 		git-gui/po/zh_cn.po                        
ERROR                                              
ERROR commit 1eeab31: break because this commit is not for git-l10n 
INFO checking commits: 0 passed, 1 failed.        
------------------------------------------------------------------------------
INFO downloading pot file from https://github.com/git-l10n/pot-changes/raw/pot/master/po/git.pot 

ERROR: fail to execute "git-po-helper check-commits"

[jiangxin]

Hi, @TC999

This project is not the one you want to contribute to (git-gui).
According to the documentation in Documentation/SubmittingPatches,
please try to send a pull request to Johannes Sixt's repository.

== Subsystems with dedicated maintainers

Some parts of the system have dedicated maintainers with their own
repositories. 

- `git-gui/` comes from git-gui project, maintained by Johannes Sixt:

        https://github.com/j6t/git-gui 

- `gitk-git/` comes from Paul Mackerras's gitk project:

        git://git.ozlabs.org/~paulus/gitk
  
   Those who are interested in improving gitk can volunteer to help Paul
   maintain it, cf. <YntxL/fTplFm8lr6@cleo>.

- `po/` comes from the localization coordinator, Jiang Xin:

        https://github.com/git-l10n/git-po/