Permissionsper language are not implemented yet. You do not even have a user interface forthis. There are permissions per pages sections and content workflow but not forlanguages.
Perhapsyou can enable the workflow and give certain permissions only to people thatshould approve the content. This way you could be sure that there will be nocontent published by someone who should not touch this language pages.
Sitefinity4.0 Processional edition will have rule based security, so you willbe able to configure different custom rules for your web sitepermissions.
the Telerik team