Author: Marina Glancy
MDL-49257 grades: strings adjustments
http://git.moodle.org/gw?p=moodle.git;a=commit;h=b3892e62a58a727116990704c1440e5af8bcb245
http://github.com/moodle/moodle/commit/b3892e62a58a727116990704c1440e5af8bcb245
+ 2.9 en [gradebookcalculationsfixbutton,core_grades]
+ 2.9 en [gradebookcalculationswarning,core_grades]