Subtitle support now works, and also shows subtitles for videos that haven't been downloaded yet.

Just needed a couple of small tweaks, and can take advantage of some cleaner coding to show subtitle availability both when videos exist, and when they don't.

![image](https://f.cloud.github.com/assets/4072455/1650673/29b39b0e-5aa3-11e3-8853-4b127a4ecf01.png)

![image](https://f.cloud.github.com/assets/4072455/1650672/201df544-5aa3-11e3-9a87-0a643a155d58.png)