Add greek and ability to change language via dropdown

Part of #243 

![screen shot 2013-12-01 at 01 44 12](https://f.cloud.github.com/assets/159200/1649782/738275b2-5a2a-11e3-99e7-5017e0d6bc42.png)
![screen shot 2013-12-01 at 01 44 22](https://f.cloud.github.com/assets/159200/1649783/73a738c0-5a2a-11e3-8e17-45441fb806ce.png)
![screen shot 2013-12-01 at 01 45 39](https://f.cloud.github.com/assets/159200/1649784/73aa5fc8-5a2a-11e3-94f8-83c3b2c18be0.png)