Author: Michael Hughes
MDL-48215 gradingform_guide: Name length validation
Validating both criterion name and guide name to be 255 chars.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=175883c22393e96d027bd291ec65006bb816b097
http://github.com/moodle/moodle/commit/175883c22393e96d027bd291ec65006bb816b097
+ 2.7 en [err_shortnametoolong,gradingform_guide]