Clarify empty hw and group note in full details

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

@@ -10,13 +10,17 @@
       <v-card-title class="text-subtitle-2 pb-1 font-weight-medium">
         {{ $t("alsijil.coursebook.summary.homework.label") }}
       </v-card-title>
-      <v-card-text>{{ documentation.homework || "–" }}</v-card-text>
+      <v-card-text>
+        {{ documentation.homework || $t("alsijil.coursebook.summary.homework.empty_yet") }}
+      </v-card-text>
     </v-card>
     <v-card outlined dense rounded="lg">
       <v-card-title class="text-subtitle-2 pb-1 font-weight-medium">
         {{ $t("alsijil.coursebook.summary.group_note.label") }}
       </v-card-title>
-      <v-card-text>{{ documentation.groupNote || "–" }}</v-card-text>
+      <v-card-text>
+        {{ documentation.groupNote || $t("alsijil.coursebook.summary.group_note.empty") }}
+      </v-card-text>
     </v-card>
   </div>
 </template>

aleksis/apps/alsijil/frontend/messages/en.json

@@ -66,7 +66,8 @@
         "homework": {
           "label": "Homework",
           "value": "HW: {homework}",
-          "empty": "No homework"
+          "empty": "No homework",
+          "empty_yet": "No homework defined yet."
         },
         "group_note": {
           "label": "Group note",