Note: After saving, you have to bypass your browser's cache to see the changes. Google Chrome, Firefox, Microsoft Edge and Safari: Hold down the ⇧ Shift key and click the Reload toolbar button. For details and instructions about other browsers, see Wikipedia:Bypass your cache.
$( function () {
    if( mw.config.get( "wgPageName" ) === "Special:Undelete" &&
            window.location.search.indexOf( "timestamp=" ) >= 0 ) {
        mw.loader.using( [ "mediawiki.util" ], function () {
            $( "#bodyContent" ).prepend( $( "<div>" )
                .attr( "id", "contentSub2" )
                .append( "< ", $( "<a>" )
                    .attr( "href", mw.util.getUrl( "Special:Undelete", { target: mw.config.get( "wgRelevantPageName" ) } ) )
                    .text( "All deleted revisions" ) ) );
        } );
    }
} );
Allikas: http://en.wikipedia.org/wiki/User:Enterprisey/undelete-backlink.js
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