core/homeassistant/components/edl21/strings.json

{
  "config": {
    "abort": {
      "already_configured": "[%key:common::config_flow::abort::already_configured_device%]"
    },
    "step": {
      "user": {
        "title": "Add your EDL21 smart meter",
        "data": {
          "serial_port": "[%key:common::config_flow::data::usb_path%]"
        }
      }
    }
  }
}