New setting delegated_qa to store QA managers

qa/ui/src/routes/themes/+page.svelte

@@ -1,9 +1,11 @@
 <script>
  import { goto } from '$app/navigation';
 
+ import { auth } from '$lib/stores/auth';
  import { themes } from '$lib/stores/themes';
 
  import {
+     Button,
      Container,
      Table,
  } from 'sveltestrap';
@@ -19,6 +21,14 @@
 </script>
 
 <Container class="mt-2 mb-5">
+    {#if $auth && $auth.is_manager}
+        <Button
+            href="export"
+            class="float-end"
+        >
+            Exporter toutes les remarques
+        </Button>
+    {/if}
     <h2>
         Scénarios
     </h2>