update batch import wording

app/dashboard/templates/dashboard/batch_import.html

@@ -8,10 +8,15 @@
   <div class="card">
     <div class="card-body">
       <h1 class="h3">Alias Batch Import</h1>
+      <div class="alert alert-primary">
+        Only aliases created with <b>your verified domains</b> can be imported.<br>
+        Please make sure to use the csv template file.
+      </div>
+
       <p>
         The import can take several minutes.
         Please come back to this page to verify the import status. <br>
-        Only aliases created with <b>your verified domains</b> can be imported.<br>
+
         If an alias already exists, it won't be imported.
       </p>