Some experts say that renaming the Administrator account is pointless. Any worthy hacker knows that the true Administrator account has a unique identifier and how to find it. But, that doesn't mean you need to make it easy for the hackers who aren't worthy.
Exchange 2003 supports OWA interface in different languages. When using Internet Explorer 5 and above, the Language settings of Internet Explorer is sent to the OWA server which is turn changes the OWA interface to the matching language.