Describe the bug
When I use an embed url to insert a video I expect it will be displayed in the description of the debate. Instead it only appears on the M card.

We should use a reflector in decidim_sanitize instead of simple_format.
Please see comments about this in: https://meta.decidim.org/processes/bug-report/f/210/proposals/14192

Screenshots

Extra data (please complete the following information):

• Decidim Version: 0.16
• Decidim installation: Metadecidim

Additional context
https://meta.decidim.org/processes/bug-report/f/210/proposals/14192