Author: Rossiani Wijaya
MDL-34558 accessibility compliance for filter: Add forform input text and select tag
http://git.moodle.org/gw?p=moodle.git;a=commit;h=0013540d2f0c62f100ce888d9d34eab679a36957
http://github.com/moodle/moodle/commit/0013540d2f0c62f100ce888d9d34eab679a36957
+ 2.4 en [algebraicexpression,filter_algebra]