Fixed: FS#1118 - [client_id] is not resolved in .php-fcgi-starter

Added European Portuguese translation. Many thanks to Miguel Almeida to provide this language file set.

- Added a missing language string for the website form.

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- Added a robots.txt file in the root directory of the ispconfig interface to prevent it from being spidered by search engine robots that follow the robots excusion standard.
- Fixed a error message in the installer.

Added a function to retrieve the client_id for a given sysuser_id to the remotting API: client_get_id($session_id,$sys_userid);

Impoved the software update function to enable the installation of apps like phpmyadmin into the apps vhost.

- Better default settings for the "Normal" spamfilter policy.

Modified loadUserProfile function i discovered using mailuser interface from horfic after many tests and debugs functions recive a value iguals to userid field not sys_userid.
I keep sysuser_id testing for compatibility issues no have any idea if this used in another place and added aditional userid test. 
Tested all things and used auto-response with roundcube with this modifications all worked fine.
More info see here: http://www.howtoforge.com/forums/showthread.php?t=38437&page=15

Fixes Encoding to UTF-8 and Add Some New Strings

Deleted the client id check, now he goes directly to the sysuser_id. Now you don't have to use the client id anymore, only more the sysuser_id. Solves issue when client has more than one sysuser