Youtube videos not playing on https

Youtube videos are not playing when OAE is using https. For example, when adding http://www.youtube.com/watch?v=0XqEiVXWcI8 as a video to https://oae.oae-qa0.oaeproject.org, the video does not display.

```
Blocked loading mixed active content "http://www.youtube.com/embed/TkV822e3bvo?wmode=transparent&jqoemcache=oW814"
```