Improve Indico extractor

This allows to differentiate the e.g. the Akademy 2021 and QtCS 2021
booking, which only differ in the subtitle.

src/lib/scripts/indico.js

@@ -7,6 +7,9 @@
 function parseRegistration(html) {
     var res = JsonLd.newEventReservation();
     res.reservationFor.name = html.eval('//h1')[0].content;
+    const subtitle = html.eval('//h3')[0].content;
+    if (subtitle)
+        res.reservationFor.name += ' - ' + subtitle;
     res.reservationNumber = html.eval('//h3/span')[0].content.match(/#(.*)/)[1];
     res.modifyReservationUrl = html.eval('//a')[0].attribute('href');
 
@@ -14,5 +17,11 @@ function parseRegistration(html) {
     res.reservationFor.startDate = JsonLd.toDateTime(time[1], "dd MMM yyyy, hh:mm", "en");
     res.reservationFor.endDate = JsonLd.toDateTime(time[2], "dd MMM yyyy, hh:mm", "en");
 
+    const dds = html.eval('//dd');
+    if (dds.length >= 2) {
+        res.underName.givenName = dds[0].content;
+        res.underName.familyName = dds[1].content;
+    }
+
     return res;
 }