Author: Dan Poltawski
MDL-32286 - fix ambigious english string
http://git.moodle.org/gw?p=moodle.git;a=commit;h=c851b734a8841128662bdb48d6a319b30485509f
http://github.com/moodle/moodle/commit/c851b734a8841128662bdb48d6a319b30485509f
+ 2.3 en [uploadextension,core]