The language were set only on session. But now it is
stored with user profile, on DB.
It is important as now I can send alert e-mails to each
user on their own languages and not the activer
user language.
Also, wherever the user logs out and logs in again,
it will see the same site locale.
The TakeController was manually sending the email message
as well as dealing with item return, so I moved the email message
to it's own listener, I created an event for it and moved the
return part to the item model.
