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I think that any step towards a user friendly experience will be a big help in creating a Japanese user base. Being able to interact with an interface written in one's own language is contributes a lot to user satisfaction. If someone can translate the phrases used in the eSteem app to Japanese, those phrases could easily be transferred to the Steemit website itself. With a good explanation of what Steemit is and how it works, I think users in Japan will be more likely to try it.