dialog-label-texts are in English even though system locale is de_DE

ADDITIONAL SYSTEM INFORMATION :
Window7 - all systemsettings are german

A DESCRIPTION OF THE PROBLEM :
Classes as JFileChooser or JOptionPane have label-texts on there UI. The Method Locale.getDefault() returns de_DE on my system, but label-texts on the dialog-UIs are in english while they should be in german.

REGRESSION : Last worked in version 11.0.2

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Create an instance of a JFileChooser and show it on a german environment

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The label-texts should be in german. For example on the cancel-Botton should be the text "Abbrechen"
ACTUAL -
The label-texts on instances of JFileChooser or JOptionPane in a german environment are in english.

---------- BEGIN SOURCE ----------
import javax.swing.JFileChooser;

public class Main {
public static void main(final String[] args) {
JFileChooser fileChooser = new JFileChooser();
fileChooser.showOpenDialog(null);
}
}
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
There is no workaround for all the issues. For example the tooltip-text of the cancel-button on a JFileChooser can not be set manually.

FREQUENCY : always