Laravel 5 translate validation attribute

How can i translate the attribute, now the output is: companyname is mandatory.

Validation.php

'required'             => ':attribute is mandatory.',

Controller:

$rules = array(
    'companyname'       => 'required'
;

View:

{{ Form::text( 'companyname' , null, array( 'class' => 'form-control' ) ) ) }}

via Chebli Mohamed