[confluence] add settings descriptions to GUI

Totally forgot to PR this one. This adds the settings descriptions to the GUI (see #2775).


![screenshot005](https://f.cloud.github.com/assets/75864/544560/2958344c-c252-11e2-8b41-5b91a8628b47.png)

![screenshot006](https://f.cloud.github.com/assets/75864/544565/386b17ce-c252-11e2-8c76-f3237169ce43.png)