Author: Petr Skoda
helps converted, import disabled for now
http://git.moodle.org/gw?p=moodle.git;a=commit;h=8da51a16501c53318f2ad5d55dbf6a079bcccdd0
http://github.com/moodle/moodle/commit/8da51a16501c53318f2ad5d55dbf6a079bcccdd0
+ 2.3 en [import_help,book]