Author: Mark Nelson
MDL-48533 report_backups: added ability to view backup logs
http://git.moodle.org/gw?p=moodle.git;a=commit;h=7bc0151a4c9bb31d97fabe02363d926908783e43
http://github.com/moodle/moodle/commit/7bc0151a4c9bb31d97fabe02363d926908783e43
+ 2.8 en [backupofcourselogs,report_backups]
+ 2.8 en [logsofbackupexecutedon,report_backups]
+ 2.8 en [nobackupsfound,report_backups]
+ 2.8 en [nologsfound,report_backups]
+ 2.8 en [strftimetime,report_backups]
+ 2.8 en [viewlogs,report_backups]