Fix incorrect label translation in return receipt (#1489963)

CHANGELOG

@@ -49,6 +49,7 @@ CHANGELOG Roundcube Webmail
 - Fix malformed recipient name when composing a message by clicking on mailto link (#1489942)
 - Fix list reload after sending message in another window (#1489931)
 - Fix so address format errors are ignored when saving a draft (#1489954)
+- Fix incorrect label translation in return receipt (#1489963)
 
 RELEASE 1.0.1
 -------------

program/steps/mail/func.inc

@@ -1816,7 +1816,7 @@ function rcmail_send_mdn($message, &$smtp_error)
         $body = $RCMAIL->gettext("yourmessage") . "\r\n\r\n" .
             "\t" . $RCMAIL->gettext("to") . ': ' . rcube_mime::decode_mime_string($message->headers->to, $message->headers->charset) . "\r\n" .
             "\t" . $RCMAIL->gettext("subject") . ': ' . $message->subject . "\r\n" .
-            "\t" . $RCMAIL->gettext("sent") . ': ' . $RCMAIL->format_date($message->headers->date, $RCMAIL->config->get('date_long')) . "\r\n" .
+            "\t" . $RCMAIL->gettext("date") . ': ' . $RCMAIL->format_date($message->headers->date, $RCMAIL->config->get('date_long')) . "\r\n" .
             "\r\n" . $RCMAIL->gettext("receiptnote");
 
         $compose->headers($headers);