public function setEmail(string $elementName, string $errorMessage = null): \IvoPetkov\BearFrameworkAddons\Form\Constraints
    {
        if ($errorMessage === null) {
            $errorMessage = __('ivopetkov.form.This is not a valid email address.');
        }
        $this->data[] = ['email', $errorMessage, $elementName];
        return $this;
    }