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It is strange. But I think "empty" is wrong.
<pre>
$ grep -2 -n empty ja.yml en.yml
ja.yml-132- confirmation: "が一致しません。"
ja.yml-133- accepted: "を受諾してください。"
ja.yml:134: empty: "を入力してください。"
ja.yml-135- blank: "を入力してください。"
ja.yml-136- too_long: "は%{count}文字以内で入力してください。"
--
en.yml-111- confirmation: "doesn't match confirmation"
en.yml-112- accepted: "must be accepted"
en.yml:113: empty: "cannot be empty"
en.yml-114- blank: "cannot be blank"
en.yml-115- too_long: "is too long (maximum is %{count} characters)"
</pre>
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I agree with the proposal to change notice_failed_to_save_members.

I think that changing strings derived from https://github.com/svenfuchs/rails-i18n/blob/master/rails/locale/ja.yml is not good solution, because it increases our burden of maintenance.
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I have sent pull request.
https://github.com/svenfuchs/rails-i18n/pull/565
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Sorry,
I created a patch which changed part only.

If you're going to adapt https://github.com/svenfuchs/rails-i18n/blob/master/rails/locale/ja.yml that full stop is removed I think had better use "。" instead of "." in the notice_failed_to_save_members statement.

If you need it I create a patch.
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Committed in trunk r14470 and r14471.
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