Add front-end messages to inform when demo mode is On

resources/js/components/App.vue

@@ -1,7 +1,12 @@
 <template>
-    <main class="main-section">
-        <router-view></router-view>
-    </main>
+    <div>
+        <div v-if="$appSettings.isDemoApp" class="demo has-background-warning has-text-centered is-size-7-mobile">
+            {{ $t('commons.demo_do_not_post_sensitive_data') }}
+        </div>
+        <main class="main-section">
+            <router-view></router-view>
+        </main>
+    </div>
 </template>
 
 <script>