Issue 1292 - Updated invalid certificate message to be a bit more user-f...

Issue 1292 - Updated invalid certificate message to be a bit more user-friendly.

"The security certificate of the server you are connecting to is invalid.  This may mean that your connection to your server is insecure.  You can accept the key and continue insecurely or reject the key and abort the connection to your mail server.  If you don\'t know you should reject the key and contact your mail administrator. \n\nThe server\'s certificate is presented below for you to review:\n\n"