Widget Visibility: update wording for the logged in condition

"Logged In" and Logged Out" sound better than "yes" and "no" imo
See #826

Before:
![screen shot 2014-10-10 at 11 59 05 am](https://cloud.githubusercontent.com/assets/426388/4591733/44ebf2a8-5071-11e4-89ec-628b1f4fe104.png)

After:
![screen shot 2014-10-10 at 12 02 32 pm](https://cloud.githubusercontent.com/assets/426388/4591731/3e250cc0-5071-11e4-836c-a4998fe15318.png)