/**
     * Get the value for the key 'search_engine.password'. <br>
     * The value is, e.g.  <br>
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getSearchEnginePassword();

    /**
     * Get the value for the key 'search_engine.password' as {@link Integer}. <br>
     * The value is, e.g.  <br>

    public String normalizeHtmlLang(final String value) {
        final String defaultLang = ComponentUtil.getFessConfig().getCrawlerDocumentHtmlDefaultLang();
        if (StringUtil.isNotBlank(defaultLang)) {
            return defaultLang;
        }

        return normalizeLang(value);
    }

    public String normalizeLang(final String value) {
        if (StringUtil.isBlank(value)) {
            return null;
        }

    public static final String LABELS_app_value = "{labels.app_value}";

    /** The key of the message: Default Label Value */
    public static final String LABELS_default_label_value = "{labels.default_label_value}";

    /** The key of the message: Default Sort Value */
    public static final String LABELS_default_sort_value = "{labels.default_sort_value}";

    /** The key of the message: Virtual Hosts */