Stable release 2.92.0

What's Changed

• Add <phrase role="style:..."> support by @tomschr in #548
• Missing xsl:attribute to create "lang" attribute by @tomschr in #550
• Fix "Request for a label of unexpected element" by @tomschr in #554
• Fix #524: Add footnote template in mode=xref-to by @tomschr in #553
• Implement JSON-LD by @tomschr in #552

Full Changelog: 2.91.2...2.92.0