Author: Dan Poltawski
MDL-33624 lang - remove incosistent use of placeholder
http://git.moodle.org/gw?p=moodle.git;a=commit;h=b8722357c718e5252cfdc19e76c162b1aeca3431
http://github.com/moodle/moodle/commit/b8722357c718e5252cfdc19e76c162b1aeca3431
+ 2.2 en [invalidcourseid,core_error]