Make Emails translatable via transifex #6025

The transifex translation add in to the email templates.
The optional environment variable NOTIFICATIONS_TRANSLATION_PATH added to config.

services/userlog/pkg/service/conversion.go

@@ -355,8 +355,10 @@ func composeMessage(nt NotificationTemplate, locale string, path string, vars ma
 	}
 
 	message, err := executeTemplate(messageraw, vars)
+	if err != nil {
+		return "", "", "", "", err
+	}
 	return subject, subjectraw, message, messageraw, err
-
 }
 
 func loadTemplates(nt NotificationTemplate, locale string, path string) (string, string) {