Author: David Mudrak
NOMDL backup: added missing string
http://git.moodle.org/gw?p=moodle.git;a=commit;h=54255c1bace4852fb6db1f6d2c01270ebe0c77b3
http://github.com/moodle/moodle/commit/54255c1bace4852fb6db1f6d2c01270ebe0c77b3
+ 2.0 en [backuptypeactivity,core_backup]