translateThree method
Implementation
String translateThree(String key1, String key2, String key3){
String value1 = current.value[key1.toLowerCase()] ?? key1;
String value2 = (current.value[key2.toLowerCase()] ?? key2).toLowerCase();
String value3 = (current.value[key3.toLowerCase()] ?? key3).toLowerCase();
return '$value1 $value2 $value3';
}