[ZD#773918] fix font issue in Windows and update status style

:bug:

Windows users don't have 'Lucida Grande', so we need some decent fallback fonts for them. 'Serif' is not acceptable :crying_cat_face: . We should use Zendesk Lotus' body element's `font-family`.

I also updated the status label CSS to match the new UI changes in Lotus:

/cc @maximeprades 

#### References:

- [[ZD#773918] Lucida Grande Font Used in "User Data" Sidebar App Doesn't Render In Chrome On Windows (7)](https://support.zendesk.com/agent/?zat=true#/tickets/773918)

![user-data-app](https://cloud.githubusercontent.com/assets/1010128/3592596/a69c570e-0c74-11e4-8491-2d1a2853d24f.png)