[Translators] Japanese translation update

[Paul]

On Fri, 15 Dec 2017 21:16:07 +0900 (JST)
UTUMI Hirosi <utuhiro78 at yahoo.co.jp> wrote: 

> I have the mail in the Yahoo's sent box, so something was wrong.

Aha. It got dumped by bogofilter in the 'unsure' folder and I hadn't
checked there.

Anyway, I do not instantaneously commit the submitted updates, but
instead commit them all in one go on release day.

with regards

Paul