[Merge] lp:~tkikuchi/mailman/2.1-ja into lp:mailman/2.1

Tokio Kikuchi has proposed merging lp:~tkikuchi/mailman/2.1-ja into lp:mailman/2.1. Requested reviews: Mailman Coders (mailman-coders) Japanese translation update for 2.1.14 -- https://code.launchpad.net/~tkikuchi/mailman/2.1-ja/+merge/29251 Your team Mailman Coders is requested to review the proposed merge of lp:~tkikuchi/mailman/2.1-ja into lp:mailman/2.1.