fixed typos

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

src/main/java/de/srsoftware/widerhall/mail/SmtpClient.java

@@ -11,6 +11,8 @@ import java.util.Date;
 import java.util.List;
 import java.util.Properties;
 
+import static de.srsoftware.widerhall.Util.t;
+
 public class SmtpClient {
     private static final Logger LOG = LoggerFactory.getLogger(SmtpClient.class);
     private static final String HOST = "mail.smtp.host";