Add support for localized site section titles

[nolannbiron]

[WIP] Waiting for API release

[changeset-bot]

⚠️ No Changeset found

Latest commit: 4d40922

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[github-actions]

Summary of the deployments:

Version	URL	Status
Vercel		❌
Cloudflare		❌

Test content

Site	2v	2c
GitBook	/url/gitbook.com/docs	/url/gitbook.com/docs
E2E	/url/gitbook.gitbook.io/test-gitbook-open	/url/gitbook.gitbook.io/test-gitbook-open