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=f81c3a32f0e60acf73534854318e467963814799
http://github.com/moodle/moodle/commit/f81c3a32f0e60acf73534854318e467963814799
+ 2.3 en [algebraicexpression,filter_algebra]