Updated Japanese translation

[TAKAHASHI Tamotsu]

Hi Kevin,

Thanks again for the next release.

Please push this new ja.po.

You have always helped us.
This time, your L10N comments enabled me to update ja.po
without even a glance at the code.
I don't mind whether msgmerge wraps lines or not,
but I was motivated by the fact that you let us choose.

Regards,
Tamo
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