Bug 19105 - XSS Stored in holidays.pl

Bug 19105 - XSS Stored in holidays.pl

To Test
1. Hit the page /cgi-bin/koha/tools/holidays.pl
2. Select the date
3. Add a text in the field Title and Description that contains js
4. Save the page.
5. Notice js is execute
6. Apply patch and reload, the js is escaped

Fixed for all holidays

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
(cherry picked from commit 1ceb4367c6879be812b600487385c53bb005260d)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>