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Merge pull request #19 from kyoshino/locale-ja

Update Japanese (ja) l10n
Commit from Mozilla Verbatim by user jasnapaka@jasnapaka.com.: 137 of 137 strings translated (0 fuzzy).
Commit from Mozilla Verbatim by user sara.todaro@mozillaitalia.org.: 136 of 137 strings translated (1 fuzzy).