The column names are already in the xml: CustomerID, Name, Address etc.
If your question is about having the language specific titles that are visible in your datagrid, that is not usual in XML exports. If that is what you need, maybe the export to csv or excel is more suited to your needs? These exports do this automatically without the need to do any mapping.
If you really need that tags “CustomerID” etc modified, i guess you need to modify them in your xsd file before setting up the mapping. But i am not sure about that.