Log Message:
Update to 1.31

Upstream changes:
1.31     2020-12-22

- The docs for each locale now show examples of its strftime patterns as well.

1.30     2020-12-15

- The previous release included some locale data for locales that had been
  deleted from CLDR 38.0.0.

1.29     2020-12-14

- Rebuilt all locale data with the data from CLDR 38.0.0 and glibc 2.32.