Author: Jun Pataleta
MDL-87245 lang: Add a bracketed form of the opensinnewwindow lang string
http://git.moodle.org/gw?p=moodle.git;a=commit;h=e2f1a37ab501f4b857a70a8c1bb9f4e0d782ef26
http://github.com/moodle/moodle/commit/e2f1a37ab501f4b857a70a8c1bb9f4e0d782ef26
+ 4.5 en [opensinnewwindowbracketed,core]