zh-cn pages added

content/de/docs/audio/_index.md

content/de/docs/labels/_index.md

content/en/docs/audio/_index.md

content/en/docs/labels/_index.md

content/es/docs/audio/_index.md

content/es/docs/labels/_index.md

content/fr/docs/audio/_index.md

content/fr/docs/labels/_index.md

content/ja/docs/audio/_index.md

content/ja/docs/labels/_index.md

content/ko/docs/audio/_index.md

content/ko/docs/labels/_index.md

content/nl/docs/audio/_index.md

content/nl/docs/labels/_index.md

content/pt/docs/audio/_index.md

content/ru/docs/audio/_index.md

content/ru/docs/labels/_index.md

content/zh-cn/contribute/thanks/_index.md

content/zh-cn/docs/accounts/_index.md

content/zh-cn/docs/audio/_index.md