Add image caption to the magic popup layout - updated

<script>
( function( $ ) {
    $( document ).ready( function() {
        $( window ).bind( "load", function() {
            var galleryItem = $( ".et_pb_gallery_item" );
            galleryItem.each( function() {
                var captionText = $( this ).find( ".et_pb_gallery_caption" ).text(),
                    trigger = $( this ).find( "a" );
                trigger.click( function() {
                    setTimeout( function() {
                        var previewTitle = $( ".mfp-title" ).text();
                        $( ".mfp-title" ).text( previewTitle + ": " + captionText );
                    }, 100 )

                } )
            } )
        } );
    } );
} )( jQuery );
</script>