Modify WordPress/Genesis Comment Form Labels

modify-comment-labels.php

<?php
//* Do NOT include the opening php tag

/**********************************
*
* Filter Comments Form Labels
* Modify the Labels Text 
* Add Font-Awesome Icons to Labels
* 
* Only for Genesis HTML5 themes
* Genesis HTML5 themes use the default WordPress 
* comment forms
* 
* XHTML themes have to use comment_form_defaults to filter all fields
*
* @author AlphaBlossom / Tony Eppright
* @link http://www.alphablossom.com
*
************************************/

/*
 * 
 * Filter Author, Email, and URL labels
 *
 */
add_filter( 'comment_form_default_fields', 'youruniqueprefix_modify_comment_author_email_url_labels' );

function youruniqueprefix_modify_comment_author_email_url_labels( $fields ) {

	$commenter = wp_get_current_commenter();
	$req      = get_option( 'require_name_email' );
	$aria_req = ( $req ? " aria-required='true'" : '' );
	$args = wp_parse_args( $args );

	if ( ! isset( $args['format'] ) )
		$args['format'] = current_theme_supports( 'html5', 'comment-form' ) ? 'html5' : 'xhtml';

	$html5    = 'html5' === $args['format'];

	$fields   =  array(
		'author' => '<p class="comment-form-author">' . '<i class="fa fa-user"></i> <label for="author">' . __( 'Your Name' ) . ( $req ? ' <span class="required">*</span>' : '' ) . '</label> ' .
		            '<input id="author" name="author" type="text" value="' . esc_attr( $commenter['comment_author'] ) . '" size="30"' . $aria_req . ' /></p>',
		'email'  => '<p class="comment-form-email"><i class="fa fa-envelope"></i> <label for="email">' . __( 'Your Email' ) . ( $req ? ' <span class="required">*</span>' : '' ) . '</label> ' .
		            '<input id="email" name="email" ' . ( $html5 ? 'type="email"' : 'type="text"' ) . ' value="' . esc_attr(  $commenter['comment_author_email'] ) . '" size="30"' . $aria_req . ' /></p>',
		'url'    => '<p class="comment-form-url"><i class="fa fa-link"></i> <label for="url">' . __( 'Your Website' ) . '</label> ' .
		            '<input id="url" name="url" ' . ( $html5 ? 'type="url"' : 'type="text"' ) . ' value="' . esc_attr( $commenter['comment_author_url'] ) . '" size="30" /></p>',
	);
	return $fields;

}

/* 
 *
 * Filter Comment Field label
 *
 */
add_filter( 'comment_form_defaults', 'youruniqueprefix_change_comment_label' );

function youruniqueprefix_change_comment_label( $args ) {
	$args['comment_field'] = '<p class="comment-form-comment"><i class="fa fa-comment"></i> <label for="comment">' . _x( 'Your Comment', 'noun' ) . '</label> <textarea id="comment" name="comment" cols="45" rows="8" aria-required="true"></textarea></p>';
	return $args;
}

modify-comments-label-style.css

/* 
 * Style Comments Form Labels
 * and Font Awesome Icons
 *
 */
.comment-respond .comment-form > p > i {
    text-align: center;
    width: 25px;
}

.comment-respond label {
    display: inline-block;
}

.comment-respond input[type="email"], 
.comment-respond input[type="text"], 
.comment-respond input[type="url"] {
    display: block;
    width: 50%;
}