Fix styling

modules/admin/templates/metadata_converter.twig

@@ -52,7 +52,7 @@
     <h2 id="error">{{ 'An error occured'|trans }}</h2>
     <div class="code-box">
         <div class="code-box-content">
-            <pre id="error" class="fa-warning">{{ error }}</pre>
+            <pre id="error" class="fa fa-warning">&nbsp;&nbsp;{{ error }}</pre>
         </div>
     </div>
     {% endif -%}