Author: Dan Poltawski
MDL-28176 lang - rephrase conditional access description
http://git.moodle.org/gw?p=moodle.git;a=commit;h=157459a20a448f0e6c5e95e96601f9ddd3429125
http://github.com/moodle/moodle/commit/157459a20a448f0e6c5e95e96601f9ddd3429125
+ 2.1 en [configenableavailability,core_condition]