[PATCH v4] Improve the width of alternate representation for year in strftime [BZ #23758]

[TAMUKI Shoichi]

Hello,

Ping - any feedback about it?

https://www.sourceware.org/ml/libc-alpha/2018-12/msg00232.html

I think that this patch has been basically reviewed, and is ready for
the further review especially for documentation, wording, etc.

According to the copyright year, since the Japanese localedata was
introduced to glibc on around 1999 (Heisei year 11), it will be the
first opportunity to encounter the problem when the year becomes one
digit due to the next era change.

So, it would be greatly appreciated if you could review this for 2.29.

Thank you for your cooperation.

Regards,
TAMUKI Shoichi