459 google translate customization

- Fixes #459 - Adds an environment variable for the Google Translate customization
code provided by the Google Translator Widget Wizard.

- Simplifies Google Translate Widget to use Dropdown only display mode
and sets translation to all languages by default instead of leaving out
Latin, Esperanto and Welsh. This avoids listing out the included
languages.

![screen shot 2014-08-01 at 11 10 04 am](https://cloud.githubusercontent.com/assets/704760/3782935/31b86168-19a7-11e4-853e-63add60db3c2.png)

@monfresh Ready for review and merge. Please add `GOOGLE_TRANSLATE_CUSTOMIZATION_CODE: 7134d9633bb06c42-b1d34b8461a5ad94-ge515acac7e8a7274-23` as an environment variable to ohana-web-search-demo.herokuapp.com after merging this.