This module synchronizes content taxonomy and fields accross translations:
First you need to select which fields should be synchronized. Then, after a node has been updated, all enabled vocabularies and fields will be synchronized as follows:
Note that permissions are not checked for each node. So if someone can edit a node and it is set to synchronize, all the translations will be synchronized anyway.
To enable synchronization check content type options to select which fields to synchronize for each node type.
The list of available fields for synchronization will include some standard node fields and all CCK fields. You can add more fields to the list in a configuration variable. See README.txt for how to do it.
For more information, see the online handbook entry for Internationalization module.