Author: Andrew Nicols
MDL-56295 mod_book: Refactor of chapter delete page
http://git.moodle.org/gw?p=moodle.git;a=commit;h=985ec993591d5a0d7af69fd500a8d10de05115c1
http://github.com/moodle/moodle/commit/985ec993591d5a0d7af69fd500a8d10de05115c1
+ 3.2 en [chapterandsubchaptersdeleted,mod_book]
+ 3.2 en [chapterdeleted,mod_book]