refs #6014 make sure Goals_Ecommerce is loaded client side even if goals plugin is not activated

plugins/SitesManager/SitesManager.php

@@ -259,5 +259,6 @@ class SitesManager extends \Piwik\Plugin
         $translationKeys[] = "SitesManager_SelectDefaultTimezone";
         $translationKeys[] = "SitesManager_DefaultCurrencyForNewWebsites";
         $translationKeys[] = "SitesManager_SelectDefaultCurrency";
+        $translationKeys[] = "Goals_Ecommerce";
     }
 }