I suggest adding an honorific suffix "さん" ("san") to Japanese messages.

In Japanese, it is rare and sometimes impolite not to add honorific suffixes referring to others in a conversation. For example, people say "Maeda-san" when talking to me. You can see more examples even on this site, such as #28125#note-18, #27009#note-5, and #25775#note-4. There are various honorific suffixes in Japanese. The most commonly used one is "さん" ("san"). Many localized software use "さん" in Japanese messages.

The attached patch adds "さん" after "%{author}".

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