This is a clone of the same issue that was already fixed for 1.9.12. However, 2.0.2+ does not seem to support embedded <iframe> in the category descriptions. What is worse, <iframe> tags are dropped when upgrading from 1.9.11+ containing them to 2.0.2+. The original description from the cloned issue follows:

If an iframe is included as part of a course category description, it is not displayed on the course categories page. This is because the description is cleaned, and the iframe tag stripped out.