Impacted versions: Master - probably all

Steps to reproduce:
Go to Settings Screen

Current behavior:
You'll see Authentification written twice.  In English, and especially in English technology speak the usual word is Authentication.

The only real issue it causes is that when searching for docs, you would search for Authentication (e.g. "How do I setup Oauth Authentication with provider x?"

Expected behavior:

Video/Screenshot link (optional):
![image](https://user-images.githubusercontent.com/5093264/29589757-99092af0-87ea-11e7-8bbe-dd8593b54d42.png)

Seems it occurs 4 times in code, but didn't want to PR as I don't understand translations
![image](https://user-images.githubusercontent.com/5093264/29589851-1e30f71c-87eb-11e7-94a7-fdb16a9eeccf.png)

FIx if you want, close if you want, I won't be offended and can manage


addons/base_setup/models/res_config_settings.py
template_id = self.env.ref(template)
        return {
            'type': 'ir.actions.act_window',
            'res_model': 'ir.ui.view',
            'view_type': 'form',
            'view_mode': 'form',
            'res_id': template_id.id,
        }
    @api.multi
    def edit_external_header(self):
        return self._prepare_report_view_action('web.external_layout_' + self.external_report_layout)
    @api.multi
    def change_report_template(self):
        self.ensure_one()
        template = self.env.ref('base.view_company_report_form')
        return {
            'name': _('Choose Your Document Layout'),
            'type': 'ir.actions.act_window',
            'view_type': 'form',
            'view_mode': 'form',
            'res_id': self.env.user.company_id.id,
            'res_model': 'res.company',
            'views': [(template.id, 'form')],
            'view_id': template.id,
            'target': 'new',
        }