- The goal here is to prevent the losing of the choices by having a bad name.
	- This is a POC, there is probably some cleaning before merge

* Now works on windows servers
* Byebye .po/.mo, welcome .json
* Byebye old gettext library, welcome o80-i18n

New files :
* classic_poll.js -> loaded on page choix_autre.php
* date_poll.js -> loaded on page choix_date.ph
* framadatepicker.js -> loaded on pages that need the date picker

First: Block the poll (no more modification)
Second: Delete the poll 60 days after the expiration date (configurable)