Author: David Monllao
MDL-10259 core Adding a search courses box if there are too many courses
http://git.moodle.org/gw?p=moodle.git;a=commit;h=2904faa0eb3bd762caa0a1f95e78fccd06f999c2
http://github.com/moodle/moodle/commit/2904faa0eb3bd762caa0a1f95e78fccd06f999c2
+ 2.3 en [therearecourses,core]