Settign buttonLablke in CCaptcha

In the Contact Form I would like to change button label from get a new code to


Image not Clear?. Click here to try another image.',

Where would i change it I believe Ccaptcha has this property ‘buttonLabel’, but where and how do I set it?




$this->widget('CCaptcha', array(

    'buttonLabel'=>'Image not Clear? Click here to try another image.',

    'clickableImage'=>true,

    'imageOptions'=>array('title'=>'Click to get a new image'),

));