[TASK] No Translations needed for default marker values

Classes/Service/MailTemplateService.php

@@ -294,9 +294,13 @@ class MailTemplateService {
 			$previewMarker = [];
 			$markerArray = self::$registerArray[$this->extensionKey][$this->templateName]['marker'];
 			foreach ($markerArray as $marker) {
-				$previewMarker[$marker['marker']] = LocalizationUtility::translate(
-					$marker['backend_translation_key'], $marker['extension_key']
-				);
+				if ($marker['backend_translation_key']) {
+					$previewMarker[$marker['marker']] = LocalizationUtility::translate(
+						$marker['backend_translation_key'], $marker['extension_key']
+					);
+				} else {
+					$previewMarker[$marker['marker']] = $marker['value'];
+				}
 			}
 			$this->setIgnoreMailQueue(TRUE);
 			$this->setMarkers($previewMarker);