src/Javascript/MessageParser.php
public function getMessage($attribute, $rule, $parameters)
    {
        $data = $this->fakeValidationData($attribute, $rule, $parameters);

        $message = $this->validator->getMessage($attribute, $rule);
        $message = $this->validator->makeReplacements($message, $attribute, $rule, $parameters);

        $this->validator->setData($data);

        return $message;
    }
public function getMessage($attribute, $rule, $parameters)
    {
        $data = $this->fakeValidationData($attribute, $rule, $parameters);

        $message = $this->validator->getMessage($attribute, $rule);
        $message = $this->validator->makeReplacements($message, $attribute, $rule, $parameters);

        $this->validator->setData($data);

        return $message;
    }
Replace javascript error message place-holders with actual values.

@param string $attribute
@param string $rule
@param array  $parameters
@return mixed