change the error hint from suggesting to change the owner of a directory to changing the permissions. changing the owner of a director is not possible via ftp.

new "external" application. you can integrate external application like roundcube, squirellmail or a wiki into ownCloud.

removed '/' from file path because only Unix people understand the concept of that. Plus, 'Files' itself is the root.

Signed-off-by: Florian Pritz <bluewind@xinu.at>