Author: Mark Nelson
MDL-48533 report_backups: added ability to view backup logs
http://git.moodle.org/gw?p=moodle.git;a=commit;h=127210170d5dbeae2f27571d5be026c43dabb58d
http://github.com/moodle/moodle/commit/127210170d5dbeae2f27571d5be026c43dabb58d
+ 2.7 en [backupofcourselogs,report_backups]
+ 2.7 en [logsofbackupexecutedon,report_backups]
+ 2.7 en [nobackupsfound,report_backups]
+ 2.7 en [nologsfound,report_backups]
+ 2.7 en [strftimetime,report_backups]
+ 2.7 en [viewlogs,report_backups]