Invalid Hreflang Language Codes

This page has hreflang tags with several types of invalid codes:

• hreflang="english" - Full language name instead of ISO 639-1 code
• hreflang="uk" - Country code used as language code (Ukraine's country code, not a language)
• hreflang="en_US" - Underscore separator instead of hyphen
• hreflang="zz" - Completely invalid language code
• hreflang="fr-XX" - Valid language but invalid region code

Hreflang tags must use valid ISO 639-1 language codes and (optionally) ISO 3166-1 alpha-2 region codes, separated by a hyphen.

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