Comment 10 for bug 435930

Can design please comment on the wording of the warning. As proposed, it is a warning dialog like this:

Title: 'Warning: Data will be deleted'
Content: 'Please be aware that this is a "guest session". It means that your data will be automatically deleted when you log out, and possible altered settings will be reset.'
Optional content: 'There is an exception: Files that you save in the folder /var/guest-data will be preserved.'

The optional content is not shown on a default install (it requires a sysadmin to create /var/guest-data).