Fix for #1457: hide individual progress bars when downloading dubbed videos 

![image](https://f.cloud.github.com/assets/1319950/2225695/43a927ba-9a93-11e3-9427-4e257004830a.png)

and new behavior

![image](https://f.cloud.github.com/assets/1319950/2225728/e78c8930-9a93-11e3-8135-db723f4c8ee5.png)