[IMP] website: keyword search base on language on website promote

- Task: https://www.odoo.com/web/#id=8805&view_type=form&model=project.task&action=333&active_id=131
- Pad: https://pad.odoo.com/p/r.QSI79TcaBa81Jnmc
It should not be auth='public' but auth='user'. (it's an exploit, everyone can call Google Suggest on behalf of your server)
I would not put "keywords" and "lang" in the URL, just in argument.