vanilla.theme

 /**
  * Implements hook_preprocess_menu().
  */
 function vanilla_preprocess_menu(&$vars, $hook) {
   if ($hook == 'menu_main') {
     kint($hook);
     $items = $vars['items'];
     foreach ($items as $key => $item) {
       $original_title = $vars['items'][$key]['title'];
       $vars['items'][$key]['title'] = array(
         '#markup' => $original_title,
         '#allowed_tags' => array('span', 'svg', 'use'),
       );
     }
   }
 }