Updated Czech language files.

interface/lib/lang/cz.lng

interface/web/admin/lib/lang/cz_server_config.lng

interface/web/admin/lib/lang/cz_system_config.lng

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

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

interface/web/mail/lib/lang/cz_mail_backup_list.lng

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

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

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

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

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

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

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

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