ha-core/homeassistant/components/litterrobot/translations/ja.json

{
    "config": {
        "step": {
            "user": {
                "data": {
                    "password": "\u30d1\u30b9\u30ef\u30fc\u30c9",
                    "username": "\u30e6\u30fc\u30b6\u30fc\u540d"
                }
            }
        }
    }
}