Add Dashicon to search form button in a WordPress site built with the Genesis Framework

functions.php

<?php
//* Add this to your functions.php file. Do NOT include the opening php tag

//* Add Dashicon to search form button 
add_filter( 'genesis_search_button_text', 'ab_search_button_icon' );
function ab_search_button_icon( $text ) {
	return esc_attr( '&#xf002;' );
}