Calendar events and iCal feeds

aleksis/core/frontend/components/calendar/CalendarOverview.vue

@@ -64,6 +64,7 @@
             <v-btn
               v-for="calendarType in availableCalendarTypes"
               :value="calendarType.type"
+              :key="calendarType.type"
             >
               <span class="hidden-sm-and-down">{{
                 nameForMenu(calendarType)