Event description breaks ICS export

This event https://balotta.org/event/presentazione-di-sentieri-proletari-a-cura-di-ape-bologna can't be added to calendar via ICS, and breaks the main ICS export.

The issue is due to bad alignment after X-ALT-DESC in ics file

presentazione-di-sentieri-proletari-a-cura-di-ape-bologna.ics