hass-core/homeassistant/components/whirlpool/strings.json

{
  "config": {
    "step": {
      "user": {
        "data": {
          "username": "[%key:common::config_flow::data::username%]",
          "password": "[%key:common::config_flow::data::password%]"
        }
      }
    },
    "error": {
      "cannot_connect": "[%key:common::config_flow::error::cannot_connect%]",
      "invalid_auth": "[%key:common::config_flow::error::invalid_auth%]",
      "unknown": "[%key:common::config_flow::error::unknown%]"
    }
  }
}