Set cancel substitution confirm dialog title

aleksis/apps/chronos/frontend/components/calendar_feeds/details/LessonDetails.vue

@@ -170,7 +170,11 @@
           v-model="amendEvent.delete"
           :item="selectedEvent.meta"
           @success="updateOnSave()"
-        />
+        >
+          <template #title>
+            {{ $t("chronos.event.amend.delete_dialog") }}
+          </template>
+        </delete-dialog>
       </v-card-actions>
     </template>
   </base-calendar-feed-details>

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

@@ -30,6 +30,7 @@
       "amend": {
         "edit_button": "Change",
         "delete_button": "Reset",
+        "delete_dialog": " Are you sure you want to delete this substitution?",
         "delete_success": "The substitution was deleted successfully.",
         "title": "Change lesson",
         "subject": "Subject",