add cookiefirst necessary script-attributes

Modules/Core/ViewConfig.php

@@ -115,8 +115,7 @@ class ViewConfig extends ViewConfig_parent
      */
     public function getGtmScriptAttributes() :string
     {
-        $oConfig = Registry::getConfig();
-        $sCookieId = $oConfig->getConfigParam('d3_gtm_settings_cookieName');
+        $sCookieId = trim(Registry::getConfig()->getConfigParam('d3_gtm_settings_cookieName'));
 
         if (false === $this->shallUseOwnCookieManager()){
             return "";
@@ -144,6 +143,10 @@ class ViewConfig extends ViewConfig_parent
             }
         }
 
+        if ($this->sCookieManagerType === ManagerTypes::COOKIEFIRST){
+            return 'type="text/plain" data-cookiefirst-category="' . $sCookieId .'"';
+        }
+
         return "";
     }