Make date-picker display obey locale in recent Thunderbird versions
Make date-picker display obey locale in recent Thunderbird versions

Fix the date-picker so that the order of the day, month, and year in
the date-picker obey the locale settings, in recent Thunderbird
versions.

Fixes #17, #22.

jikamens/send-later,jikamens/send-later,jikamens/send-later,jikamens/send-later