core/homeassistant/components/sfr_box/translations/cs.json

{
    "entity": {
        "sensor": {
            "line_status": {
                "state": {
                    "unknown": "Nezn\u00e1m\u00fd"
                }
            },
            "training": {
                "state": {
                    "unknown": "Nezn\u00e1m\u00fd"
                }
            }
        }
    }
}