added export module (#538)

src/Twig/Extensions.php

@@ -86,6 +86,13 @@ class Extensions extends \Twig_Extension
         'user' => 'fas fa-user',
         'visibility' => 'far fa-eye',
         'settings' => 'fas fa-wrench',
+        'export' => 'fas fa-database',
+        'pdf' => 'fas fa-file-pdf',
+        'csv' => 'fas fa-table',
+        'ods' => 'fas fa-table',
+        'xlsx' => 'fas fa-file-excel',
+        'on' => 'fas fa-toggle-on',
+        'off' => 'fas fa-toggle-off',
     ];
 
     /**