Added limits for websites and FTP users.

interface/web/client/form/client.tform.php

interface/web/client/lib/lang/en_client.lng

interface/web/client/templates/client_edit_limits.htm

interface/web/sites/ftp_user_edit.php

interface/web/sites/lib/lang/en_ftp_user.lng

interface/web/sites/lib/lang/en_web_domain.lng

interface/web/sites/web_aliasdomain_edit.php

interface/web/sites/web_domain_edit.php

interface/web/sites/web_subdomain_edit.php

server/plugins-enabled/apache2_plugin.inc.php