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

[Yasuhito FUTATSUKI at POEM]

Yasuhito FUTATSUKI at POEM has proposed merging lp:~futatuki/mailman/2.1-ja-translation into lp:mailman/2.1.

Commit message:
Update ja translation

Requested reviews:
  Mailman Coders (mailman-coders)

For more details, see:
https://code.launchpad.net/~futatuki/mailman/2.1-ja-translation/+merge/349853

Update ja translation including
* fix missed one '"' (double quote character) in HTML attribute.
* revise some translation message
* translate untranslated messages
* unify comma and full stop character in Japanese context into U+3001 (toten as comma) and U+3002 (kuten as full stop). 
  (cf. https://en.wikipedia.org/wiki/Japanese_punctuation#Japanese_punctuation_marks)
-- 
Your team Mailman Coders is requested to review the proposed merge of lp:~futatuki/mailman/2.1-ja-translation into lp:mailman/2.1.
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