Refine for I18n and make sure all the docs are in English or Chinese

Fix the docs of English and Chinese.

Look for documentation files in the repository, likely in directories like 'docs/' or 'README.md'. Identify any non-English or non-Chinese text. The goal is to ensure all documentation is only in English or Chinese, which may involve translating or removing other languages. Check if there are existing translation files or a localization setup.

索引モデルが issue の本文から書いたものです。