Fix git loading of odd locales

This should make git loading be able to load git saves with arbitrary
weekday names. Even strange German ones.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Don't use locale for git save format

I stupidly used "weekday()" without realizing we localize it. And we
really don't want to make save formats be localized (we don't localize
decimal numbers etc either).

This fixes the git save format to just use a hardcoded weekday list.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>