Author: Andrew Davis
gradebook MDL-23433 made some strings a bit clearer
http://git.moodle.org/gw?p=moodle.git;a=commit;h=4ce5fe9e323b3e5c33ec0c913384adab26363a60
http://github.com/moodle/moodle/commit/4ce5fe9e323b3e5c33ec0c913384adab26363a60
+ 2.0 en [showallhidden,core_grades]
+ 2.0 en [showhiddenitems_help,core_grades]
+ 2.0 en [shownohidden,core_grades]