* Do str_replace only on the $dirname variable

Conflicts:
	admin/index.php
	adminstuds.php
	app/classes/Framadate/Utils.php
	app/inc/config.template.php
	app/inc/init.php
	choix_autre.php
	choix_date.php
	composer.json
	composer.lock
	creation_sondage.php
	locale/de_DE/LC_MESSAGES/Studs.mo
	locale/de_DE/LC_MESSAGES/Studs.po
	locale/en_GB/LC_MESSAGES/Studs.mo
	locale/fr_FR/LC_MESSAGES/Studs.mo
	studs.php

Fix Collisions

See merge request !34

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

Bugfix et reprises à partir de la version en prod