rework datatables

data/web/templates/admin/tab-routing.twig

@@ -1,6 +1,6 @@
 <div role="tabpanel" class="tab-pane fade" id="tab-routing" role="tabpanel" aria-labelledby="tab-routing">
   <div class="card mb-4">
-    <div class="card-header d-flex">
+    <div class="card-header d-flex fs-5">
       <button class="btn d-md-none flex-grow-1 text-start" data-bs-target="#collapse-tab-routing" data-bs-toggle="collapse" aria-controls="ollapse-tab-routing">
         {{ lang.admin.relayhosts }}
       </button>