MediaWiki:Common.js

$( '.additional' ).each(function() {

                   var $elem = $(this);
   var $toggle = $('<a href="#">mehr< class="bs-icon-info"></a>');
   $toggle.on( 'click', function( e ) {
       $elem.toggleClass( 'show' );
       e.defaultPrevented = true;
   });
   $toggle.insertBefore( $elem );

            

});