mean-translate language fix

Hello,

I believe I found a bug in the mean-translate package this weekend. I pulled in the package from a bare bones mean.io setup, and noticed that the language drop down wasn't pulling in the languages from the db. So I changed the markup, and added the directive name to the element.

I also noticed that the default language wasn't saving either so I fixed that little bit as well.

Please have a look, and let me know if this helps.

Thanks,

-Adam