Issue:
While try to launch a meeting in IE 9, Add-in does not launch and gives an error: “Could not find language file….”
Solution:
Disable “Do not save encrypted pages to disk” option by following the below steps:
1: On the Tools menu, click Internet Options.
2: On the Advanced tab, scroll to Security, and uncheck “Do not save encrypted pages to disk” check box.
Try to launch the meeting again and it should launch fine.

this article should read “uncheck Do not save encrypted pages to disk” instead of “select the Do not save encrypted pages to disk check box.”