Language.fromMap constructor
Creates a Language from a map.
'isoCode' and 'name' are required. 'nativeName' is optional and falls back to 'name'.
Implementation
Language.fromMap(Map<String, String> map)
: isoCode = map['isoCode']!,
name = map['name']!,
nativeName = map['nativeName'] ?? map['name']!;