1023187: Events for Rules addition and delete were missing event string.

This resulted in messages in the atom feed such as

<messageText>Unknown event for user admin and target 4.4</messageText>

New strings were addded, and the correct text is shown.
Reduce the line length to fix the style checks
Merge pull request #416 from candlepin/bkearney/1023187

1023187: Events for Rules addition and delete were missing event string.