relevanceLanguage property
The relevanceLanguage parameter instructs the API to return search
results that are most relevant to the specified language. The parameter
value is typically an ISO 639-1 two-letter language code. However, you
should use the values zh-Hans for simplified Chinese and zh-Hant for
traditional Chinese. Please note that results in other languages will
still be returned if they are highly relevant to the search query term.
string
Implementation
final String? relevanceLanguage;