How to change language at runtime in java swing

I try to change the Locale at runtime in my swing application.
But I can't figure out how it supposed to work, or there are no master plan?

I can only think of two choices:
1. Restart the application, not the best user experience.
2. Create a localization manager that can register/unregister components, on a change it just iterate all components and change the text.

Both 1 and 2 feels awkward.

Other info:
For the moment the orientation is not a target.
The application is obfuscated.

Example:

LocRes_en.properties:

    text1 = English text

LocRes_ja.properties

    text1 = Japanese text

ChangeLocale.java:

    import java.awt.EventQueue;
    import java.awt.FlowLayout;
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;
    import java.util.Locale;
    import java.util.ResourceBundle;

    import javax.swing.JButton;
    import javax.swing.JFrame;
    import javax.swing.JLabel;

    public class ChangeLocale {

        private JFrame frame;

        public static void main(String[] args) {
            EventQueue.invokeLater(new Runnable() {
                public void run() {
                    try {
                        ChangeLocale window = new ChangeLocale();
                        window.frame.setVisible(true);
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
            });
        }

        public ChangeLocale() {
            initialize();
        }

        private void initialize() {
            frame = new JFrame();
            frame.setBounds(100, 100, 450, 300);
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            FlowLayout flowLayout = new FlowLayout(FlowLayout.CENTER, 5, 5);
            frame.getContentPane().setLayout(flowLayout);

            JButton btnChangeLoc = new JButton("Ch