show iarc descriptors and interactive elements (bug 931947)

- Reflect API changes in Zamboni app resource (https://github.com/mozilla/zamboni/pull/1382).
- Display PEGI content descriptor icons when in PEGI-seered regions.
- Display interactive element icons in every other region than PEGI-seered ones

**Interactive Elements Mobile**
![screen shot 2013-11-18 at 3 24 19 pm](https://f.cloud.github.com/assets/674727/1568086/bb7c20e2-50a8-11e3-8fbe-2aecd51f6bab.png)


**Interactive Elements Desktop**

![screen shot 2013-11-18 at 3 24 14 pm](https://f.cloud.github.com/assets/674727/1568082/b5e17bc8-50a8-11e3-8528-9b6791120bb3.png)


**Descriptors Mobile**

![screen shot 2013-11-18 at 3 24 48 pm](https://f.cloud.github.com/assets/674727/1568087/be3f95ac-50a8-11e3-9939-5b8706c8d9e1.png)


**Descriptors Desktop**
![screen shot 2013-11-18 at 3 24 51 pm](https://f.cloud.github.com/assets/674727/1568109/35a2c632-50a9-11e3-9c89-bf78bc4f8e3e.png)


**Heading**

For "Generic" ratings body. For other rating systems, it will read for example "ESRB: Everyone" or "PEGI: For ages 3+"

![screen shot 2013-11-18 at 3 24 57 pm](https://f.cloud.github.com/assets/674727/1568117/50feaff4-50a9-11e3-94a6-0ca69886c479.png)