Verify that the dubbed video system still works.

Hi @aronasorman 

This will fixed  #2717.

I update the language drop down menu selector and create a language variable to identify the selected language.

The language drop down at the top of the topic title is depending on the default language use.

![screen shot 2014-12-09 at 10 36 51 pm](https://cloud.githubusercontent.com/assets/8663934/5358878/f2aa7a66-7ff3-11e4-8567-12bdc3ad75c0.png)

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