apps: add route to list sites for operators

the main backup listing route is only available for admins

dashboard/src/components/app/Location.vue

@@ -261,6 +261,7 @@ onMounted(async () => {
     <br/>
     <Checkbox v-if="needsOverwriteDns" v-model="overwriteDns" :label="$t('app.location.dnsoverwrite')"/>
 
+    <br/>
     <Button @click="onSubmit()" :loading="busy" :disabled="busy || (app.error && app.error.details.installationState !== ISTATES.PENDING_LOCATION_CHANGE) || app.taskId || !formValid">{{ $t('app.location.saveAction') }}</Button>
   </div>
 </template>