Fix Login problem if it's an email

If the login is an email, we had an error as the @ symbol was already used in the ticket creation.
Therefore, I just replace the potential @ in the login by it's html equivalent &#64;
Merge branch 'fixloginforcasicam'
Merge pull request #8 from ProjetIcam-BarCafetLille/master

Fix problem if the login is an email