Author: Jayesh Anandani
MDL-39054 quiz statistics: move hard-coded text to lang file
http://git.moodle.org/gw?p=moodle.git;a=commit;h=7ec3994f784b123a06f6720080ede13d6506ef3c
http://github.com/moodle/moodle/commit/7ec3994f784b123a06f6720080ede13d6506ef3c
+ 2.4 en [partofquestion,quiz_statistics]