Laravel 5.1 How to translate attribute values in the form validation messages?

I need to translate the attribute values for the form validations. So I have duplicated the English validation errors and translated them to Farsi. Everything works but the attribute values are still in English. I thought I need to put the translation of attributes in the attributes array in the validation file as follows, but it's not working.

'attributes' => [
        'username '=>'نام کاربری'
    ],

How can I translate them?

via Chebli Mohamed