language
Specifies the language on the map labels using the BCP 47 language tag, limited to ISO 639-1 two-letter language codes. If the specified language data isn't available for the map image, the labels will default to the regional primary language.
Supported codes:
arasazbebgbnbscacscydadeeleneseteufifofrgaglgnguhehihrhuhyidisitjakakkkmknkokyltlvmkmlmrmsmtmynlnoorpaplptroruskslsqsrsvtatethtrukuzvizh