Improve dup serno error message: bug 219980 r=ssaux

security/manager/ssl/resources/locale/en-US/pipnss.properties

@@ -213,7 +213,7 @@ BadPassword=An incorrect password was provided.
 BadDatabase=There is a problem with your certificate database [Error Code: %S].
 BadServer=%S has sent an incorrect or unexpected message. Error Code: %S
 BadClient=%S has received an incorrect or unexpected message. Error Code: %S
-HostReusedIssuerSerial=You have received an invalid certificate.  It contains the same issuer name and serial number as another certificate that you are already using. Please contact the server administrator or email correspondent from which this invalid certificate came, and urge them to get a valid certificate.
+HostReusedIssuerSerial=You have received an invalid certificate.  Please contact the server administrator or email correspondent and give them the following information:\n\nYour certificate contains the same serial number as another certificate issued by the certificate authority.  Please get a new certificate containing a unique serial number.
 SSLGenericError=Error establishing an encrypted connection to %S. Error Code: %S.
 TimeOut=Connection request timed out.
 PeersCertUntrusted=Could not establish an encrypted connection because certificate presented by %S is not trusted.