Add datalayer to groups price calculator

public/typo3conf/ext/ep_theme/Resources/Private/Assets/js/components/GroupsPriceCalculator.vue

@@ -374,6 +374,10 @@ export default {
                     this.formErrors = response.data.errors;
                 } else {
                     this.submitted = true;
+                    window.dataLayer = window.dataLayer || [];
+                    dataLayer.push({
+                        'event': 'Preisberechnung'
+                    })
                 }
             }).catch(error => {
             }).finally(() => {