Author: Mikhail Golenkov
MDL-72953 core_lang: Add string for new timezone Pacific/Kanton
http://git.moodle.org/gw?p=moodle.git;a=commit;h=1b158e1e45a1d94ee56db8f2f21fc1c6fe85488d
http://github.com/moodle/moodle/commit/1b158e1e45a1d94ee56db8f2f21fc1c6fe85488d
+ 3.10 en [pacific/kanton,core_timezones]