Author: Aparup Banerjee
MDL-42711 made all theme menu strings in chat popup translatable
http://git.moodle.org/gw?p=moodle.git;a=commit;h=6f8624f77a537949491657d3c9dd8655a0e12592
http://github.com/moodle/moodle/commit/6f8624f77a537949491657d3c9dd8655a0e12592
+ 2.6 en [bubble,mod_chat]
+ 2.6 en [compact,mod_chat]