protected String getIconOnlyButtonText(String title, String ariaLabel) {
        String text = (title != null) ? title : ariaLabel;
        return (text != null) ? text : "ui-button";
    }
Gets the ARIA text for an icon only button for screen readers.
@param title the tooltip for the button
@param ariaLabel the ARIA label for the button
@return either title, or ARIA label, or fallback "ui-button"
primefaces/src/main/java/org/primefaces/renderkit/CoreRenderer.java