Author: Dan Poltawski
MDL-28176 lang - rephrase conditional access description
http://git.moodle.org/gw?p=moodle.git;a=commit;h=dc52f193ebe6306edd65a72f4b8a1b8961d186ac
http://github.com/moodle/moodle/commit/dc52f193ebe6306edd65a72f4b8a1b8961d186ac
+ 2.2 en [configenableavailability,core_condition]