Display number of participations in dummy

aleksis/apps/alsijil/frontend/components/coursebook/documentation/LessonNotes.vue

@@ -5,9 +5,9 @@
     <!-- eslint-disable @intlify/vue-i18n/no-raw-text -->
     <v-chip dense color="success">
       <v-chip small dense class="mr-2" color="green darken-3 white--text"
-        >26</v-chip
+        >{{ documentation.participations.length }}</v-chip
       >
-      von 30 anwesend
+      Schüler
     </v-chip>
     <v-chip dense color="warning">
       <v-chip small dense class="mr-2" color="orange darken-3 white--text"