Author: Damyon Wiese
MDL-38933 Assign - improved wording for help string.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=f39aaadb35bed9b6cf0c5547d1b1c17771a333be
http://github.com/moodle/moodle/commit/f39aaadb35bed9b6cf0c5547d1b1c17771a333be
+ 2.5 en [attemptreopenmethod_help,mod_assign]