Error: Table of Contents and Word renaming styles based on Word language settings...

Using norwegian Word 2003, (all updates installed).
Our Company use different languages, but we share the same templates.
I receive documents from the others, (Enlish/swedish/Finnish..)
and when i open these documents the original stylenames are renamed into
Norweian;
Header 1 change name to Oveskrift 1, and keeps all the userdefined
formats...

Problem: The TOC (tabe of Content) with all its subelevel still refer to
Heading 1,
(inside the fieldcode), and when uptdating the TOCit looks for Heading 1
style which is now Overskrift 1, and therby generates an error!!

What is the solution to solve this whitout changing inside the field? Is it
best to create new stylenames in all our templates but call it
Our_Heading1 and use it
in the TOC?

It seems that it is not a good idea to use the buildt in stylenames if they
are used in a field, and if the documnets are changed by different language
versions?

(-and we can not change all the word languageversions into English..)

Hope for help...
Arne