It is possible to have a different header for each interface language.
Select Administration > Portal > Templates and add a header template for each interface language, as shown in the following example:
If the interface language is en, the template set in header.en-US.vm is generated.
If the interface language is en-GB, the template set in header.en-GB.vm is generated.
If the interface language is fr-FR, the default template set in header.vm is generated.