Author: Mark Nelson
MDL-49200 core_form: corrected string
http://git.moodle.org/gw?p=moodle.git;a=commit;h=21e6dc4d5224e659190381cd380b39adaac26b8c
http://github.com/moodle/moodle/commit/21e6dc4d5224e659190381cd380b39adaac26b8c
+ 2.7 en [err_maxlength,core_form]