core/homeassistant/components/rainmachine/strings.json

{
  "config": {
    "step": {
      "user": {
        "title": "Fill in your information",
        "data": {
          "ip_address": "Hostname or IP Address",
          "password": "[%key:common::config_flow::data::password%]",
          "port": "[%key:common::config_flow::data::port%]"
        }
      }
    },
    "error": {
      "identifier_exists": "Account already registered",
      "invalid_credentials": "Invalid credentials"
    },
    "abort": {
      "already_configured": "This RainMachine controller is already configured."
    }
  }
}