Notification of string changes

Author: Serge Gauthier
MDL-31356 enrol_imsenterprise: Continue development for added features
* Add the possibility to make it works as before (with categrory name or idnumber).
* Add possibility to specify nested categories by name or idnumber.
* Fix error in core_course_courselib_testcase::test_course_created_event because dependency with imsenterprise


http://git.moodle.org/gw?p=moodle.git;a=commit;h=cc6b92483a8fc04ed86c1655c51c3e4505816385
http://github.com/moodle/moodle/commit/cc6b92483a8fc04ed86c1655c51c3e4505816385

+ 3.2 en [categoryidnumber,enrol_imsenterprise]
+ 3.2 en [categoryidnumber_desc,enrol_imsenterprise]
+ 3.2 en [categoryseparator_desc,enrol_imsenterprise]
+ 3.2 en [nestedcategories,enrol_imsenterprise]
+ 3.2 en [nestedcategories_desc,enrol_imsenterprise]