fix: demo localized title and description not working bug

[liuyib]

🤔 这个变动的性质是？/ What is the nature of this change?

• [ ] 新特性提交 / New feature
• [x] bug 修复 / Fix bug
• [ ] 样式优化 / Style optimization
• [ ] 代码风格优化 / Code style optimization
• [ ] 性能优化 / Performance optimization
• [ ] 构建优化 / Build optimization
• [ ] 网站、文档、Demo 改进 / Website, documentation, demo improvements
• [ ] 重构代码或样式 / Refactor code or style
• [ ] 测试相关 / Test related
• [ ] 其他 / Other

🔗 相关 Issue / Related Issue

v2 版本中，demo 的多语言切换没有实现，v1 中正常

💡 需求背景和解决方案 / Background or solution

📝 更新日志 / Changelog

Language	Changelog
🇺🇸 English	fix: locale not work in demo
🇨🇳 Chinese	fix: demo 中多语言设置无效

[vercel[bot]]

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[liuyib]

@PeachScript 大佬，可以再看下~