odoo/addons/hr_contract/security/hr_contract_security.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
    <data noupdate="1">

        <record id="group_hr_contract" model="res.groups">
            <field name="name">Human Resources / Contracts</field>
        </record>

    </data>
</openerp>