I am not familiar enough with translate tags but Talk pages project/Feature summary/ja is not ideal. Currently only one paragraph is translatable, while the remaining do not appear in Special:Translate.
Topic on Talk:Talk pages project/Feature summary
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@PPelberg (WMF), is the section about the Reply tool "finished enough" that it's worth translating?
Yikes, @Whatamidoing (WMF)...I'm sorry for the lag. Yes, the Talk pages project/Feature summary#Reply_Tool section is "finished enough."