/**
     * Retrieves the current user's locale from the request manager.
     *
     * @return the user's locale, or Locale.ROOT if not available
     */
    private static Locale getUserLocale() {
        final Locale locale = ComponentUtil.getRequestManager().getUserLocale();
        if (locale == null) {
            return Locale.ROOT;
        }
        return locale;
    }

    /**

        Locale locale = ComponentUtil.getRequestManager().getUserLocale();
        if (locale == null) {
            locale = Locale.ENGLISH;
        }
        String url = DocumentUtil.getValue(doc, fessConfig.getIndexFieldUrl(), String.class);
        if (url == null) {
            url = ComponentUtil.getMessageManager().getMessage(locale, "labels.search_unknown");
        }

     * Gets the help URL for a given base URL.
     *
     * @param url The base URL.
     * @return The localized help URL.
     */
    protected String getHelpUrl(final String url) {
        final Locale locale = ComponentUtil.getRequestManager().getUserLocale();
        if (locale != null) {
            final String lang = locale.getLanguage();
            if (ComponentUtil.getFessConfig().isOnlineHelpSupportedLang(lang)) {

        /**
         * Returns the locale.
         *
         * @return The locale.
         */
        public Locale getLocale() {
            return locale;
        }

        /**
         * Sets the locale.
         *
         * @param locale The locale.
         */
        public void setLocale(final Locale locale) {
            this.locale = locale;
        }
    }

    /**

        assertFalse(labelTypeHelper.matchLocale(Locale.ENGLISH, Locale.JAPANESE));
        assertFalse(labelTypeHelper.matchLocale(Locale.SIMPLIFIED_CHINESE, Locale.TRADITIONAL_CHINESE));

        assertTrue(labelTypeHelper.matchLocale(null, Locale.ROOT));
        assertTrue(labelTypeHelper.matchLocale(Locale.ENGLISH, Locale.ROOT));
        assertTrue(labelTypeHelper.matchLocale(Locale.ROOT, Locale.ROOT));

        // Execute
        OptionalThing<Locale> result = provider.findBusinessLocale(null, mockRequestManager);

        // Verify
        assertTrue(result.isPresent());
        Locale locale = result.get();
        assertEquals("no", locale.getLanguage());
        assertEquals("NO", locale.getCountry());
        assertEquals("NY", locale.getVariant());
    }

        case 1:
            return new Locale(parts[0]);
        case 2:
            return new Locale(parts[0], parts[1]);
        case 3:
            return new Locale(parts[0], parts[1], parts[2]);
        default:
            return LocaleUtil.getDefault();
        }
    }

    private static Supplier<Locale> defaultLocaleSupplier;

    /**
     * Returns the default locale.
     *
     * @return the default locale

        // Test with various locale configurations
        Locale[] testLocales = { Locale.US, Locale.UK, Locale.CANADA, Locale.FRANCE, Locale.CHINA, Locale.KOREA, new Locale("es", "ES"),
                new Locale("pt", "BR") };

        for (Locale locale : testLocales) {
            OptionalThing<String> result = provider.determineAlias(locale);

# Access: http://localhost:8080/admin/?browser_lang=sv
```

## Troubleshooting

### Language doesn't appear in dropdown

- Verify both `fess_label_[locale].properties` and `fess_message_[locale].properties` exist
- Check that locale code is in `supported.languages` in `fess_config.properties`
- Regenerate Java classes: `mvn dbflute:freegen`
- Rebuild project: `mvn clean package`
- Restart Fess application

            } catch (final Exception e) {
                logger.debug("Failed to parse locale: name={}", name, e);
            }
        }
        return OptionalObject.empty();
    }

    @Override
    public OptionalThing<Locale> getRequestedLocale(final RequestManager requestManager) {
        return OptionalObject.empty(); // means browser default
    }