Author: Mihail Geshoski
MDL-72093 mod_chat: Replace strings in secondary nav
http://git.moodle.org/gw?p=moodle.git;a=commit;h=55dd65a1f2caf426d98b5825fd575098cd773ba7
http://github.com/moodle/moodle/commit/55dd65a1f2caf426d98b5825fd575098cd773ba7
+ 4.0 en [pastsessions,mod_chat]