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

{
    "config": {
        "abort": {
            "no_devices_found": "No Google Cast devices found on the network.",
            "single_instance_allowed": "Only a single configuration of Google Cast is necessary."
        },
        "step": {
            "confirm": {
                "description": "Do you want to set up Google Cast?"
            }
        }
    }
}