Author: Hieu Nguyen Dang
MDL-80489 qtype_ddtos: Help Text for Choices section
http://git.moodle.org/gw?p=moodle.git;a=commit;h=a15c17cc0e398a470d051bc428352022b4c622c8
http://github.com/moodle/moodle/commit/a15c17cc0e398a470d051bc428352022b4c622c8
+ 4.5 en [choicesacceptedtext,qtype_ddwtos]