ha-core/homeassistant/components/ovo_energy/strings.json

{
    "config": {
        "error": {
            "already_configured": "[%key:common::config_flow::abort::already_configured_account%]",
            "invalid_auth": "[%key:common::config_flow::error::invalid_auth%]",
            "cannot_connect": "[%key:common::config_flow::error::cannot_connect%]"
        },
        "step": {
            "user": {
                "data": {
                    "username": "[%key:common::config_flow::data::username%]",
                    "password": "[%key:common::config_flow::data::password%]"
                },
                "description": "Set up an OVO Energy instance to access your energy usage.",
                "title": "Add OVO Energy Account"
            }
        }
    }
}