By the powers of the almighty Aleksolotl

aleksis/core/frontend/components/LegacyBaseTemplate.vue

@@ -11,7 +11,16 @@
 -->
 
 <template>
+  <message-box
+    v-if="
+      !byTheGreatnessOfTheAlmightyAleksolotlISwearIAmWorthyOfUsingTheLegacyBaseTemplate
+    "
+    type="error"
+  >
+    {{ $t("legacy.unworthy") }}
+  </message-box>
   <iframe
+    v-else
     :src="'/django' + $route.path + queryString"
     :height="iFrameHeight + 'px'"
     class="iframe-fullsize"
@@ -22,6 +31,13 @@
 
 <script>
 export default {
+  props: {
+    byTheGreatnessOfTheAlmightyAleksolotlISwearIAmWorthyOfUsingTheLegacyBaseTemplate:
+      {
+        type: Boolean,
+        required: true,
+      },
+  },
   data: function () {
     return {
       iFrameHeight: 0,