Author: Frederic Massart
MDL-44907 admin: Better styling of admin settings validation errors
http://git.moodle.org/gw?p=moodle.git;a=commit;h=1920eebcaa490b7001be5c43e2e8cc855ca1b64c
http://github.com/moodle/moodle/commit/1920eebcaa490b7001be5c43e2e8cc855ca1b64c
+ 2.9 en [validateerror,core_admin]