What your website is lacking is the php-ssh2 package. This should be readily available from the PECL-directory (http://pecl.php.net), and you'll find the full documentations of the package here: http://php.net/manual/en/book.ssh2.php
Some linux distributions do provide this as a installer package (.dev/.rpm/etc), others don't, and you'll have to compile and install it yourself for the ssh2 functionability.
Sie haben kein ssh2 installiert, besuchen Sie www.codershell.org für weitere Informationen. 1. Hostsystem testen:
you dont have ssh2 installed, visit www.codershell.org for more information. 1. test hostsystem
the more polite greeting form (either polite or because that person is not a friend of yours) "Sie" (with uppercase s) is definately to be translated with "you" (exceptions: at the beginning of a sentence its always a uppercase Sie and could mean both -> see 2nd explanation, instead of Sie it becomes a sie because of a typo), unless its lowercase, then it means "they".