I have posted a comment at http://byotos.com/plugins/welcome-pack/, which appeared to be deleted or not yet to be accepted, thus I decided to post a comment here.
I am a Japanese and have just begun using your great plugin.
As I made Japanese Translation, I hope you will accept and include it to your next-version plugin.
Japanese Translation is comprised of two files, namely dpw-ja.po and dpw-ja.mo, which is compressed to a zip file.
The zip file is available from the following:
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