html fixes: escaping of invalid characters in URLs

modules/app.xqm

@@ -788,7 +788,7 @@ declare function app:print-beacon-links($node as node(), $model as map(*)) as el
                 for $i in map:keys($beaconMap)
                 order by $beaconMap($i)[2] collation "?lang=de-DE"
                 return 
-                    <li><a title="{$i}" href="{$beaconMap($i)[1]}">{$beaconMap($i)[2]}</a></li>
+                    <li><a title="{$i}" href="{(: replacement for invalid links from www.sbn.it :)replace($beaconMap($i)[1], '\\', '%5C')}">{$beaconMap($i)[2]}</a></li>
             }</ul>
 };