{namespace captcha=Tx_CaptchaViewhelper_ViewHelpers}
<div>
    <label><f:translate key="newComment.captcha.label" /></label>
    <f:form.textfield property="captchaResponse"  title="{f:translate(key: 'newComment.captcha.notice')}{f:translate(key: 'newComment.captcha.explain')}"/>
    <captcha:captcha />
</div>