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The module manager displays the localized name of a module. After deactivating a module, the list of modules gets refreshed and the label for the (now deactivated) module is displayed in english. After reactivating, the label is changed to the localized name again.
Created attachment 46484 [details] dialog before module deactivation
Created attachment 46485 [details] dialog after module deactivation
The Module Manager is not part of NB6.x It was replaced by Tools|Plugins which opens Plugin Manager.