[BUGFIX] Only translate template description if LLL: string

Classes/Controller/MailController.php

@@ -220,7 +220,7 @@ class MailController extends ActionController {
 			if ($languages[0]['isocode']) {
 				$templateDescription = $templateDescription[$languages[0]['isocode']];
 			}
-		} else {
+		} elseif(\strpos($templateDescription, 'LLL:') !== FALSE) {
 			$templateDescription = LocalizationUtility::translate(
 				$templateDescription, $parameters['selectedExtension']
 			);