Teredo: gray labels, not italicize them

Ref in #504
cc @jagtalon

![screenshot from 2014-06-25 09 36 51](https://cloud.githubusercontent.com/assets/4411471/3385759/cf35b19a-fc6d-11e3-82f1-f88191bba53f.png)

Personally I would have put the `append_css` on the return of the `handle remainder` rather than here?