Same as we have added "yY" and "nN" to yesexpr and noexpr in all locales (unless this is conflicting) because we assume that some people may be used to English language and involuntarily may press Y or N rather than their localized version, I suggest to add "дД" (Cyrillic "dD") and "нН" (Cyrillic "nN") to every local language of Russia, which means all *_RU locales. Of course the same applies to every ru_* locale but most probably they already contain their proper characters.