feat(i18n): support chinese language

[Sam5440]

PR Checklist

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• The commit message follows our guidelines: https://github.com/riccardoperra/co
  This pull request adds support for the Chinese (zh) language across the application's internationalization (i18n) system. It introduces Chinese translations for all major UI sections, updates locale lists to include Chinese, and ensures the language is recognized as a supported locale.

Chinese language support:

• Added comprehensive Chinese (zh) translations for all major UI components, including dashboard, sidebar, presets, bottom bar, not found page, and common UI elements in files such as dashboard.ts, sidebar.ts, presets.ts, bottombar.ts, notFound.ts, and ui.ts. [1] [2] [3] [4] [5] [6]

• Integrated the new Chinese translations into the main locale configuration in index.ts, ensuring all UI strings are available in Chinese.

Locale recognition and configuration:

• Updated all locale name lists in index.ts to include Chinese translations for language names in Italian, English, German, and Spanish contexts. [1] [2] [3] [4]

• Added zh to the list of supported locales in locales.ts, allowing the application to recognize and switch to Chinese.deimage/blob/main/CONTRIBUTING.md#commit

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[x ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[x ] No

Other information

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