Add Simplified Chinese (简体中文) Translation for Website

[vedansh-5]

Summary

Implement Simplified Chinese translation for the website

Tasks

• Create zh-CN locale and translation files.
• Translate all content including UI.
• Ensure proper font rendering for Chinese characters.
• Add 简体中文 to language dropdown.
• Verify layout compatibility for multi-byte characters.

Notes

Locale code: zh-CN

[naman9271]

Traditional chineese got translated not simplified one !!