Author: Petr Skoda
MDL-8249 localise standard role names and descriptions if empty
http://git.moodle.org/gw?p=moodle.git;a=commit;h=c52551dc3ceef52df6e86ea4d43bd1e79cba660c
http://github.com/moodle/moodle/commit/c52551dc3ceef52df6e86ea4d43bd1e79cba660c
+ 2.4 en [customroledescription,core_role]
+ 2.4 en [customroledescription_help,core_role]
+ 2.4 en [customrolename,core_role]
+ 2.4 en [customrolename_help,core_role]
+ 2.4 en [roleshortname_help,core_role]