originalLanguage property
An IETF language code indicating the original language of the review. If the review has been translated, then original_language != language. This field contains the main language tag only, and not the secondary tag indicating country or region. For example, all the English reviews are tagged as 'en', and not 'en-AU' or 'en-UK' and so on. This field is empty if there is only a rating with no review text.
Implementation
final String? originalLanguage;