working on german translation

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(t("Failed to send email to {}",user.email()),e);
+            throw new MessagingException(t("Senden der Email an {} fehlgeschlagen",user.email()),e);
         }
     }
 
@@ -368,8 +368,8 @@ public class MailingList {
      * @throws UnsupportedEncodingException
      */
     public void test(User user) throws MessagingException, UnsupportedEncodingException {
-        var subject = t("{}: test mail",name());
-        var text = "If you received this mail, the SMTP settings of your mailing list are correct.";
+        var subject = t("{}: Test-Mail",name());
+        var text = "Wenn Sie diese Nachricht empfangen haben, sind die SMTP-Einstellungen Ihrer Mailing-Liste korrekt.";
         smtp.login().send(email(),name(),user.email(),subject,text);
     }
 }