Author: Huong Nguyen
MDL-80489 qtype_ddtos: Update language string
http://git.moodle.org/gw?p=moodle.git;a=commit;h=e28937ccbcf77ae6f9c2907782a07132eb55a08e
http://github.com/moodle/moodle/commit/e28937ccbcf77ae6f9c2907782a07132eb55a08e
+ 4.5 en [choicesacceptedtext,qtype_ddwtos]