Theme handling during logout
I know it's maybe not so important to support multiple themes in ISPconfig but it's working except for a small bug in the logout method. If you have an empty session variable you use the theme configured in the config.inc.php --> The login form theme is configured here. After the login, the theme configured per user is used. But after pressing logout the variable $_SESSION["s"]["theme"] still contains the theme configured for the user. That means the login form is rendered with the user theme. If you set the theme to null in the file interface/web/login/logout.php the variable is refilled with the setting in config.inc.php and the login form is redered with the right theme.