Author: Dan Poltawski
MDL-36109 accesibility: use proper words for logo alt text
http://git.moodle.org/gw?p=moodle.git;a=commit;h=3a723033e8f9bea7703f4f54657b837126604a12
http://github.com/moodle/moodle/commit/3a723033e8f9bea7703f4f54657b837126604a12
+ 3.0 en [moodlelogo,core]