po/ja.po update for 5.2.1

[Tim Waugh]

Please see:
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=124862

This bug report has an attachment containing a patch to fix this
problem in po/ja.po:

Description of problem:
'ls -l' lacks '日'(day) char in Japanese environment.

Steps to Reproduce:
1. ls -l with LANG=ja_JP.UTF-8

(I won't attach it in case it gets mangled.)

Tim.
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