Bug 19103 - Stored XSS in matching-rules.pl

Bug 19103 - Stored XSS in matching-rules.pl

To Test
1. Hit the page /cgi-bin/koha/admin/matching-rules.pl
2. Click on new record matching rule
3. Add a text in the field Description that contain js.
4. Save the page.
5. Notice js is execute
6. Apply patch and reload, the js is escaped

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 9222cd77d282affffba43a40a9ff2f768647501e)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>