updated some texts

src/main/java/de/srsoftware/widerhall/data/MailingList.java

@@ -356,7 +356,7 @@ public class MailingList {
         try {
             sendConfirmationRequest(user, member.token());
         } catch (UnsupportedEncodingException e) {
-            throw new MessagingException("Failed to send email to "+user.email(),e);
+            throw new MessagingException(t("Failed to send email to {}",user.email()),e);
         }
     }
 
@@ -369,7 +369,7 @@ public class MailingList {
      */
     public void test(User user) throws MessagingException, UnsupportedEncodingException {
         var subject = t("{}: test mail",name());
-        var text = t("If you received this mail, the SMTP settings of your mailing list are correct.");
+        var text = "If you received this mail, the SMTP settings of your mailing list are correct.";
         smtp.login().send(email(),name(),user.email(),subject,text);
     }
 }