Country-specific decimal delimiter in numerical questions (and elsewhere)

In numerical questions and when displaying any decimal numbers in quiz results (and actually anywhere in Moodle) it would be nice to have the possibility to use country-specific decimal (and thousands) delimiter so that

a) teachers can define questions using their local conventions,

b) students can fill in answers using their local conventions (even more important then the preceding point),

c) figures displayed in quiz results and elsewhere in Moodle respect local conventions.

This could ideally be set up sitewide by the administrator.