Filter the output of the HeartThis for the front page

HeartThis.php

add_filter( 'heart_this_hearts', 'custom_heart_this_hearts' );
/**
 * Filter the output of the HeartThis for the front page
 *
 * @param      $output
 * @param bool $post_id
 *
 * @return string
 */
function custom_heart_this_hearts( $output, $post_id = false ) {
	if ( ! $post_id ) {
		$post_id = get_the_ID();
	}

	$output = sprintf( '<a href="#" class="heart-this" id="heart-this-%s" data-post-id="%s"><span>%s</span>%s</a>',
		uniqid(),
		$post_id,
		number_format_i18n( heart_this_get_meta( $post_id ) ),
		is_front_page() ? ' <i class="fa fa-heart"></i>' : ''
	);

	$output = sprintf( '<span class="heart-this-wrap">%s</span>', $output );

	return $output;
}