Added Chinese-China translation to the Copy with Headers feature

[wszymanski]

Context

This translation was suggested by user within a comment.

[skip changelog]

How has this been tested?

Checked translation with configuration of CopyPaste as shown below.

copyPaste: {
  copyColumnHeaders: true,
  copyColumnGroupHeaders: true,
  copyColumnHeadersOnly: true,
}

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature or improvement (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Additional language file or change to the existing one (translations)

Related issue(s):

1. Add Copy with Headers feature #10093
2. Call for translations: Copy with headers #10112 (comment)

Affected project(s):

• handsontable
• @handsontable/angular
• @handsontable/react
• @handsontable/vue
• @handsontable/vue3

Checklist:

• I have reviewed the guidelines about Contributing to Handsontable and I confirm that my code follows the code style of this project.
• My change requires a change to the documentation.

[github-actions]

Launch the local version of documentation by running:

npm run docs:review 8547b9fd50283f0995db09cb0e70c9f665394a19