Is there any way to change the comment form title when replying to someone’s comment. For example, I set my comment form title to Leave a comment but when replying to someone’s comment it needs to be changed to Leave a reply. I have tried adding the title_reply_to in arguments, but it doesn’t seem to work. Here is my comment_form call..

comment_form(array(
    'title_reply' => __( 'Leave a comment', 'pnet'),
    'title_reply_to' => __( 'Leave a Reply to %s', 'pnet'),
    'cancel_reply_link' => __('Cancel', 'pnet' )
));  

I am currently using jQuery to achieve this, but is it possible in native WordPress way?