ha_core/homeassistant/components/shell_command/strings.json

{
  "exceptions": {
    "timeout": {
      "message": "Timed out running command: `{command}`, after: {timeout} seconds"
    },
    "non_utf8_output": {
      "message": "Unable to handle non-utf8 output of command: `{command}`"
    }
  }
}