Author: Stephen Bourget
MDL-48953 choice: Improve chart labels
http://git.moodle.org/gw?p=moodle.git;a=commit;h=4784153309a6f9db5a00293e2bcfef710f9a68ba
http://github.com/moodle/moodle/commit/4784153309a6f9db5a00293e2bcfef710f9a68ba
+ 3.0 en [numberofuser,mod_choice]
+ 3.0 en [numberofuserinpercentage,mod_choice]