The first version of the iTop Data Model toolkit is available to help you adapt iTop to your specific needs. The toolkit will help you:
validate your modifications to the iTop "Data Model"
check and patch the MySQL database schema to align it with the modified data model
write the "dictionary" that provides the support for localizing iTop in different languages.
For more information about the toolkit, have a look at the following wiki page: Toolkit for modifying the data model