Updated services in publisher to reflect the username of the service

When showing multiple connected services of the same type it was impossible to ascertain which was which.  This minor adjustment adds the nickname of the connected service to the button, just like it is shown on the management page for connecting services.

![Twitter 1](http://puu.sh/1XgG5.jpg)
![Twitter 2](http://puu.sh/1XgGm.jpg)
![Facebook 1](http://puu.sh/1XgGe.jpg)