Issue #12911 has been reported by Sho Hashimoto.

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Misc #12911: Translate docs
https://bugs.ruby-lang.org/issues/12911

* Author: Sho Hashimoto
* Status: Assigned
* Priority: Normal
* Assignee: Sho Hashimoto
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translate doc/*.ja.rdoc

c.f. [ruby-dev:47319]



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