Author: David Mudrak
Yet another string using proper placeholder in Javascript
http://git.moodle.org/gw?p=moodle.git;a=commit;h=05e7fca43fb1d11dc4b3fd9c2d2abdd57ef9fe2e
http://github.com/moodle/moodle/commit/05e7fca43fb1d11dc4b3fd9c2d2abdd57ef9fe2e
+ 2.0 en [durationdays,core_enrol]