Author: Amaia Anabitarte
MDL-83873 core_calendar: New human date format
http://git.moodle.org/gw?p=moodle.git;a=commit;h=e6813f315ea468b837d7f2b7d640b4bdfe4037f5
http://github.com/moodle/moodle/commit/e6813f315ea468b837d7f2b7d640b4bdfe4037f5
+ 5.0 en [strftimerelativetoday,core_langconfig]
+ 5.0 en [strftimerelativetomorrow,core_langconfig]
+ 5.0 en [strftimerelativeyesterday,core_langconfig]