Currently the generator outputs <link rel="alternate" hreflang="en" href="...
This does work for google search, but does not work for Yandex. In Yandex I get tons of errors because of this.
Searching for this I found that link must be <xhtml:link rel="alternate" hreflang="de" href=
for more details please see google instructions https://developers.google.com/search/docs/advanced/crawling/localized-versions
Currently the generator outputs <link rel="alternate" hreflang="en" href="... This does work for google search, but does not work for Yandex. In Yandex I get tons of errors because of this. Searching for this I found that link must be <xhtml:link rel="alternate" hreflang="de" href= for more details please see google instructions https://developers.google.com/search/docs/advanced/crawling/localized-versions