Add image caption to the magic popup layout

<script>
( function( $ ) {
    $( document ).ready( 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>