I figured it out.
Used this code in the child theme functions.php:
// Additional Functions
// =============================================================================
if ( ! function_exists( 'x_social_global' ) ) :
function x_social_global() {
$facebook = x_get_option( 'x_social_facebook', '' );
$twitter = x_get_option( 'x_social_twitter', '' );
$google_plus = x_get_option( 'x_social_googleplus', '' );
$linkedin = x_get_option( 'x_social_linkedin', '' );
$xing = x_get_option( 'x_social_xing', '' );
$foursquare = x_get_option( 'x_social_foursquare', '' );
$youtube = x_get_option( 'x_social_youtube', '' );
$vimeo = x_get_option( 'x_social_vimeo', '' );
$instagram = x_get_option( 'x_social_instagram', '' );
$pinterest = x_get_option( 'x_social_pinterest', '' );
$dribbble = x_get_option( 'x_social_dribbble', '' );
$flickr = x_get_option( 'x_social_flickr', '' );
$behance = x_get_option( 'x_social_behance', '' );
$tumblr = x_get_option( 'x_social_tumblr', '' );
$whatsapp = x_get_option( 'x_social_whatsapp', '' );
$soundcloud = x_get_option( 'x_social_soundcloud', '' );
$rss = x_get_option( 'x_social_rss', '' );
$output = '<div class="x-social-global">';
if ( $facebook ) : $output .= '<a href="' . $facebook . '" class="facebook" title="Facebook" target="_blank"><i class="x-icon-facebook-square" data-x-icon=""></i></a>'; endif;
if ( $twitter ) : $output .= '<a href="' . $twitter . '" class="twitter" title="Twitter" target="_blank"><i class="x-icon-twitter-square" data-x-icon=""></i></a>'; endif;
if ( $google_plus ) : $output .= '<a href="' . $google_plus . '" class="google-plus" title="Google+" target="_blank"><i class="x-icon-google-plus-square" data-x-icon=""></i></a>'; endif;
if ( $linkedin ) : $output .= '<a href="' . $linkedin . '" class="linkedin" title="LinkedIn" target="_blank"><i class="x-icon-linkedin-square" data-x-icon=""></i></a>'; endif;
if ( $xing ) : $output .= '<a href="' . $xing . '" class="xing" title="XING" target="_blank"><i class="x-icon-xing-square" data-x-icon=""></i></a>'; endif;
if ( $foursquare ) : $output .= '<a href="' . $foursquare . '" class="foursquare" title="Foursquare" target="_blank"><i class="x-icon-foursquare" data-x-icon=""></i></a>'; endif;
if ( $youtube ) : $output .= '<a href="' . $youtube . '" class="youtube" title="YouTube" target="_blank"><i class="x-icon-youtube-square" data-x-icon=""></i></a>'; endif;
if ( $vimeo ) : $output .= '<a href="' . $vimeo . '" class="vimeo" title="Vimeo" target="_blank"><i class="x-icon-vimeo-square" data-x-icon=""></i></a>'; endif;
if ( $instagram ) : $output .= '<a href="' . $instagram . '" class="instagram" title="Instagram" target="_blank"><i class="x-icon-instagram" data-x-icon=""></i></a>'; endif;
if ( $pinterest ) : $output .= '<a href="' . $pinterest . '" class="pinterest" title="Pinterest" target="_blank"><i class="x-icon-pinterest-square" data-x-icon=""></i></a>'; endif;
if ( $dribbble ) : $output .= '<a href="' . $dribbble . '" class="dribbble" title="Dribbble" target="_blank"><i class="x-icon-dribbble" data-x-icon=""></i></a>'; endif;
if ( $flickr ) : $output .= '<a href="' . $flickr . '" class="flickr" title="Flickr" target="_blank"><i class="x-icon-flickr" data-x-icon=""></i></a>'; endif;
if ( $behance ) : $output .= '<a href="' . $behance . '" class="behance" title="Compass" target="_blank"><i class="x-icon-compass" data-x-icon=""></i></a>'; endif;
if ( $tumblr ) : $output .= '<a href="' . $tumblr . '" class="tumblr" title="Tumblr" target="_blank"><i class="x-icon-tumblr-square" data-x-icon=""></i></a>'; endif;
if ( $whatsapp ) : $output .= '<a href="' . $whatsapp . '" class="tumblr" title="Whatsapp" target="_blank"><i class="x-icon-whatsapp" data-x-icon=""></i></a>'; endif;
if ( $soundcloud ) : $output .= '<a href="' . $soundcloud . '" class="soundcloud" title="SoundCloud" target="_blank"><i class="x-icon-soundcloud" data-x-icon=""></i></a>'; endif;
if ( $rss ) : $output .= '<a href="' . $rss . '" class="rss" title="RSS" target="_blank"><i class="x-icon-rss-square" data-x-icon=""></i></a>'; endif;
$output .= '</div>';
echo $output;
}
endif;
Note: I overwrote the “Behance” line
if ( $behance ) : $output .= '<a href="' . $behance . '" class="behance" title="Compass" target="_blank"><i class="x-icon-compass" data-x-icon=""></i></a>'; endif;
Any chance to upgrade to Font Awesome 5?