show esrb for non-brazil s. american countries, minor ratings page fixes (bug 931948)

ESRB changed their requirement to be relevant not just in USA/Canada, but S. American countries that aren't called Brazil. Include Columbia, Peru, Venezuela, Uruguay, etc in the ESRB pool.

Minor ratings pages fixes include:

- show "No Descriptors" for PEGI (instead of a black box) since there's no icon for that yet.
- show text for interactive elements rather than just context-less icons

![screen shot 2013-12-04 at 3 51 47 pm](https://f.cloud.github.com/assets/674727/1678754/13a57b0e-5d3f-11e3-8444-07975ef14637.png)