Author: Michael Hawkins
MDL-72355 calendar: Update manage subscriptions language string
This has been modified to reflect the updated content on the page,
as this is now also includes exports.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=b1b8644fac6616bf502ec074ac193885758850f2
http://github.com/moodle/moodle/commit/b1b8644fac6616bf502ec074ac193885758850f2
+ 4.0 en [managesubscriptions,core_calendar]