Notice presentation language
The ISO 639-3 language code in which the notice was presented to the data subject at the time of consent. Field-critical: populate even if the UI does not require it. When the notice is available in multiple languages (see PrivacyNotice `available_languages`), this records which one the data subject actually saw. For witnessed verbal consent, this records the language of the verbal delivery.
https://publicschema.org/notice_presentation_language