Languages page is not i18nized

Hi @aronasorman,

Branch **Develop**
#2803 Fixed Languages page is not i18nized.

I have fixed the issue about the "not i18nized texts and buttons" at the page like:
*  "Show beta language packs" checkbox text.
*  "Set as default" buttons.
*  "Up to date" texts.
*  "Languages Desciption" texts.
*  "Delete" buttons.
*  "Delete Subtitles" button.
*  "Up to Date" texts.

To replicate:
    Login and set the language to non-english (example: French)
    Visit the languages page at http://127.0.0.1:8008/update/languages/
![screen shot 2014-12-16 at 6 43 10 pm](https://cloud.githubusercontent.com/assets/2810009/5452226/78f3b79a-8553-11e4-98a2-71f50f9da568.png)