An extension to add hreflang meta tags: <link rel="alternate" hreflang="" href="" />
Page translations are added automatically as hreflang tags.
Editors can configure other pages in the page properties which should be added as hreflang tags.
TER https://typo3.org/extensions/repository/view/bgm_hreflang/
Forge https://forge.typo3.org/projects/extension-bgm_hreflang/
Documentation https://docs.typo3.org/typo3cms/extensions/bgm_hreflang/
GitHub https://github.com/bgmgmbh/extension-bgm_hreflang
This extension was created by the bgm websolutions development team and Marco Huber.
Feel free to contribute and send in pull requests or create an issue.