Variable.php

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<?php
namespace Magento\Variable\Block\System;

class Variable extends \Magento\Backend\Block\Widget\Grid\Container
{
    protected function _construct()
    {
        $this->_blockGroup = 'Magento_Variable';
        $this->_controller = 'system_variable';
        $this->_headerText = __('Custom Variables');
        parent::_construct();
        $this->buttonList->update('add', 'label', __('Add New Variable'));
    }
}