core/homeassistant/components/nightscout/translations/en.json

{
    "config": {
        "abort": {
            "already_configured": "Device is already configured"
        },
        "error": {
            "cannot_connect": "Failed to connect",
            "unknown": "Unexpected error"
        },
        "flow_title": "Nightscout",
        "step": {
            "user": {
                "data": {
                    "url": "URL"
                }
            }
        }
    }
}