If you use version 4.2 of Sitefinity then you better download the Sitefinity SDK and take a look at the Products Catalog sample module. We made some important changes in the way multilingual content is handled - like your manager needs to implement the ILifecycleManager interface. As I mentioned - take a look at the Products module - it is a good source for knowledge for how to create custom modules for 4.2.
the Telerik team
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