I set the language parameter of book.json to "zh", but the displayed content is not Simplified Chinese

[DeekeScript]

book.json

{ "root": "./docs", "title": "DeekeScript", "language": "zh", "description": "描述", "structure": { "readme": "README.md", "summary": "SUMMARY.md" } }

The text above should be "输入并搜索"

[DeekeScript]

language:"zh-hans"