Author: Jason Ilicic
MDL-34427: Corrected language string when not allowed to enter the chat room.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=465775fc67b3d9b7cc38e5a250fdc1af20281d0f
http://github.com/moodle/moodle/commit/465775fc67b3d9b7cc38e5a250fdc1af20281d0f
+ 2.2 en [notallowenter,mod_chat]