Author: Dan Poltawski
MDL-19549 lang: make a string less scary
http://git.moodle.org/gw?p=moodle.git;a=commit;h=c8ad77f8767cba8f4cbaffefc5f1751f6ca5f7c2
http://github.com/moodle/moodle/commit/c8ad77f8767cba8f4cbaffefc5f1751f6ca5f7c2
+ 2.2 en [configintrotimezones,tool_timezoneimport]