ADDITIONAL SYSTEM INFORMATION :
Windows 7/64, JRE 1.8.0 172

A DESCRIPTION OF THE PROBLEM :
javafx.scene.control.DatePicker shows wrong calendar when locale is Locale("bg", "BG")
in Bulgaria we always use MONDAY as a first day of week not SUNDAY

REGRESSION : Last worked in version 8u172

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Locale.setDefault(new Locale("bg", "BG"));
final javafx.scene.control.DatePicker date = new DatePicker(LocalDate.now());



EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
a brand new DatePicker with correct first day of week - Monday (Пн in Bulgarian)
ACTUAL -
a brand new DatePicker with WRONG first day of Week - Sunday (Нд in Bulgarian)

---------- BEGIN SOURCE ----------
public class WrongBulgarianDatePicker extends Application {


    @Override
    public void start(Stage primaryStage) throws Exception {

        Locale.setDefault(new Locale("bg", "BG"));
        primaryStage.setTitle("Wrong calendar");

        StackPane root = new StackPane();
        root.getChildren().add(new DatePicker(LocalDate.now()));
        primaryStage.setScene(new Scene(root, 300, 200));
        primaryStage.show();
    }
}

---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Russian locale is with correct first day but this is unacceptable...

FREQUENCY : always