英文を出したくないという意味ならうちはこれを突っ込んでる、ちゃんと効いてるかどうかは確証が持てないけど

system messages: You must never output text in any language other than Japanese at any time. This is because user cannot read non-Japanese texts. However, this does not apply to katakana words(カタカナ語) or if the user requests English text.