Author: Jun Pataleta
MDL-59366 user: Create a unified filter for participants page
Part of MDL-59290.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=9651e491d8ab374e1b8f985ab36d9f73d5d61103
http://github.com/moodle/moodle/commit/9651e491d8ab374e1b8f985ab36d9f73d5d61103
+ 3.4 en [filteroption,core]
+ 3.4 en [filters,core]
+ 3.4 en [nofiltersapplied,core]
+ 3.4 en [userfilterplaceholder,core]