replace system message text

I want to replace the text of “The confirmation request has been sent”, what is the best way to do it? create an module and overwrite this controller?
If yes, what is the correct path I should app/code or app/design?

thanks

/magento/module-newsletter/Controller/Subscriber/NewAction.php

    private function getSuccessMessage(int $status): Phrase
{
    if ($status === Subscriber::STATUS_NOT_ACTIVE) {
        return __('The confirmation request has been sent.');
    }

    return __('Thank you for your subscription.');
}