%x short-date strftime pattern
%c full date+time strftime pattern
weekday names, Sunday-first (index 0 = Sunday)
decimal separator, e.g. ","
[AM, PM] for %p
month names, January-first; abbrevAlt/alt are the %O standalone forms
canonical id, e.g. "de_DE"
grouping (thousands) separator, e.g. "."
%r 12-hour time strftime pattern
%X 24-hour time strftime pattern
0 = Sunday, 1 = Monday (informational)
the data describing one locale, synthesized from Intl