Describe the bug
When a conference registration confirmation email is sent, sessions appear cluttered.

To Reproduce
Steps to reproduce the behavior:

1. Go to https://lid.decidim.barcelona/conferences/DataPolitik/registration?locale=en
2. Register on any session
3. Go to your email
4. See error

Expected behavior
I would expect sessions to be ordered by the time they are scheduled.

Screenshots
The conference program looks like this:

The confirmation mail looks like this:

Extra data (please complete the following information):

• Browser: Firefox
• Decidim Version: 0.19
• Decidim installation: https://lid.decidim.barcelona