VoiceOver should be able to read Swing components with the appropriate language.

This came up in a VPAT review of our desktop Swing app when we present a list of languages.

If a webpage specifies the language via the `lang` attribute (such as `<li lang="fr-FR">Français</li>`), then VoiceOver respects that attribute. I don't think there's any similar mechanism in Swing currently.

My ideal resolution would let VoiceOver / Accessibility Inspector identify the "Language" attribute based on `java.awt.Component.getLocale()`, but if there were any (reasonable) way to communicate this info the AX interfaces I'd be happy.

Sample code:

import javax.swing.*;
import javax.swing.border.EmptyBorder;
import java.awt.*;
import java.util.Locale;

/**
 * Steps to reproduce:
 * 1. Launch app
 * 2. Turn on VoiceOver
 * 3. Move the mouse over the non-English languages
 *
 * Observed behavior: VoiceOver reads them in an English-like accent.
 * Expected behavior: VoiceOver should read them in an accent matching the language they describe.
 *
 * Alternatively / more specifically: use Apple's "Accessibility Inspector" app
 * to inspect the JLabels. Observe no "Language" attribute is listed. However a
 * "Language" attribute is listed if you use a browser with HTML resembling
 * `<li lang="fr-FR">Français</li>`
 */
public class VoiceOverLanguageTest {
    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                new VoiceOverLanguageTest();
            }
        });
    }

    public VoiceOverLanguageTest() {
        JFrame f = new JFrame();
        f.getContentPane().setLayout(
                new BoxLayout(f.getContentPane(), BoxLayout.Y_AXIS));

        addLanguage(f.getContentPane(), "English", Locale.ENGLISH);
        addLanguage(f.getContentPane(), "Français", Locale.FRENCH);
        addLanguage(f.getContentPane(), "Deutsch", Locale.GERMAN);
        addLanguage(f.getContentPane(), "Italiano", Locale.ITALIAN);
        addLanguage(f.getContentPane(), "日本語", Locale.JAPANESE);

        f.pack();
        f.setVisible(true);
    }

    private void addLanguage(Container container, String str, Locale locale) {
        JLabel label = new JLabel(str);
        label.setBorder(new EmptyBorder(10,10,10,10));
        label.setLocale(locale);
        container.add(label);
    }
}