Author: Tim Hunt
MDL-27200 missing {} in various lang strings.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=12fe7031bf72f68946c1c3d5e65f8ba365fb1d1b
http://github.com/moodle/moodle/commit/12fe7031bf72f68946c1c3d5e65f8ba365fb1d1b
+ 2.1 en [gradeforstudent,core_grades]
+ 2.1 en [hexanotallowed,qtype_calculated]