Remove All localized files of Chinese

[LinuxSuRen]

All related plugins are published. Below are PRs:

jenkinsci/localization-zh-cn-plugin#31
jenkinsci/localization-support-plugin#1
jenkinsci/localization-zh-cn-plugin#71

Proposed changelog entries

• Entry 1: Localization, Remove and migrate all Chinese localization files into localizationi-zh-cn plugin

Submitter checklist

• JIRA issue is well described
• Changelog entry appropriate for the audience affected by the change (users or developer, depending on the change). Examples
  * Use the Internal: prefix if the change has no user-visible impact (API, test frameworks, etc.)
• Appropriate autotests or explanation to why this change has no tests
• For dependency updates: links to external changelogs and, if possible, full diffs

[oleg-nenashev]

Should we go forward with the merge?
CC @daniel-beck who was involved in JEP-216

[oleg-nenashev]

Will merge it tomorrow if there is no negative feedback

[daniel-beck]

localization-zh-cn now depends on the newly released localization-support that should add full support for all of this.

Would get confirmation from @LinuxSuRen that the PR build with the plugins installed retain all localizations removed here, and if so, proceed.

[MRamonLeon]

Fine if @LinuxSuRen confirms what @daniel-beck is asking.

[LinuxSuRen]

Sorry about the delay. Time difference.
@daniel-beck @MRamonLeon Yes, localization-zh-cn already contains those files. Please go ahead.

[mamh2021]

@LinuxSuRen 你这个比较坑阿。一不小心升级一下，发现没本地中文翻译了阿。后来查到你这个提交才知道要安装的插件。

[LinuxSuRen]

@mmh891113 您好，首先对给您的不方便表示歉意。不过，我们的这次变更是有在社区的邮件列表里讨论过的。另外，在版本发布的变更记录也有说明，同时，也在官方的微信公众号里也有公布。
为了能够避免类似的情况，可以关注我们的官方的媒体渠道。
谢谢您的理解和支持。