Notification of string changes

Author: Sara Arjona
MDL-70226 course: Add more options to the activitychoosertabmode setting
Some extra options have been added to the activitychoosertabmode setting, to let
admins decide when to display the Recommended tab.
Apart from that, one of these values have be set as default value for this setting,
as suggested by the UX/PX teams. So the Starter and Full presets have been updated
too with the new values.


http://git.moodle.org/gw?p=moodle.git;a=commit;h=5c20b537b4db45cc220974089aac82fd51c4a158
http://github.com/moodle/moodle/commit/5c20b537b4db45cc220974089aac82fd51c4a158

+ 4.2 en [activitychoosertabmode_desc,core_course]
+ 4.2 en [activitychoosertabmodefour,core_course]
+ 4.2 en [activitychoosertabmodefive,core_course]
+ 4.2 en [activitychoosertabmodesix,core_course]