* 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

(cherry picked from commit 9017676f)

Conflicts:
	choix_date.php

* Use Smarty to split View and Controller on studs page (work in progress)
* Add field "active" to Poll
* And some other stuff...

* Utils::issetAndNoEmpty is now removed
* Use Form object to store value from page to page

* Rename fields in Sondage table
* Add field "editable" which tells when users can edit their votes
* PDO : Configure 2 options (FETCH_OBJ + ERRMODE_EX)
* "formatsondage" does contains "+" (or not) anymore

* Store all informations about forms into an object "Form" stored in $_SESSION['form']
* Replace connection to database by PDO object
* Check if database is ready in bandeaux.php file

Accessibilité et ergonomie sur choix_date, adminstuds - remplacement bouton de langue par un select - Fix export CSV - découpage chaines de langue pour enlever le code html - Fix // et port dans get_server_name