Style corp information page language links

Previously, the alternative language links were unstyled in a bulleted list on corporate information pages. This fixes that by extracting the styling for .available-languages into a css helper, taking it out of the heading scope.

Screenshot after styling change: 

![screen shot 2014-07-03 at 15 10 48](https://cloud.githubusercontent.com/assets/110680/3470656/876637ea-02bc-11e4-874d-a354dc13bf9a.png)