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=7bfe54c41c39f89ec1309d6ede6df7dc849130e4
http://github.com/moodle/moodle/commit/7bfe54c41c39f89ec1309d6ede6df7dc849130e4
+ 2.3 en [partofquestion,quiz_statistics]