Change *.zh.yml for Chinese translation to be displayed correctly

[limimiking]

The file names of *.zh.yml is inconsistent with the key "zh-CN" in the files.
If zh is chosen for APP_LOCALE in env file, the contents will not be displayed correctly.
So I change the zh-CN to zh in *.zh.yml, then the contents are displayed normally.

Before correction:

After correction:

[gnepud]

Hi @limimiking

I knew the file names of .zh.yml is inconsistent with the key "zh-CN" in the files.
However, I cannot merge your pull request because Crowdin uses "zh-CN" in this files ".zh.yml". If we change "zh-CN" to "zh," I won't be able to sync these Chinese translation files.
Therefore, you can use "zh-CN" in the environment to resolve this issue.

RAILS_LOCALE=zh-CN
APP_LOCALE=zh-CN
MOMENT_LOCALE=zh-cn
SUMMERNOTE_LOCALE=zh-CN
ANGULAR_LOCALE=zh-cn
FULLCALENDAR_LOCALE=zh-cn
INTL_LOCALE=zh-Hans-CN

Thanks

[limimiking]

Thanks for this information. I think you should change the prompt in setup.sh or add some instructions in the documentation.