Bug 14703: Holidays description shows \r\n for every new line

Bug 14703: Holidays description shows \r\n for every new line

Adds a new line for the holiday's description instead of the string
\r\n.

Test plan:
1. In tools -> Calendar look at some holiday's description
   (Do a new holiday with description of multiple lines if
   there is not already)
2. Notice that there is characters \r\n if someone has put
   a newline in the holiday's description
3. Apply patch
4. See that the new lines show there now nicely

Sponsored-by: Vaara-kirjastot

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Amended slightly: no need to replace title.
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>