Invalid hreflang language code

HighNeeds reviewInternationalizationPer-page checkhreflang_invalid_lang_code

What this means

One or more hreflang values are not a two-letter ISO 639-1 language code, optionally followed by a region (for example `en`, `en-us`, `fr-ca`). Invalid values are ignored outright.

How to fix it

Correct the codes to valid language or language-region pairs, and remove any entries that do not describe a real localized version.

Fix effort

This check needs review: the change can be drafted for you, but a person has to approve the wording or choose the target before it ships.

Authoritative source

https://developers.google.com/search/docs/specialty/international/localized-versions

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