Yes, the parameters are language-specific and there's not much you can do
about it.

If, for example, you want Word docs to work correctly on all language
versions of Word, you may be able to stick to the English language
parameters which /may/ work in all versions of Word from around 2000
onwards, but off the top of my head I can't remember.

You could attempt some sort of per-document translation table by using SET
fields to store the correct texts for the language you want, e.g.

{ SET paramcaps "Caps" }
{ SET mytext "some test text" }
{ REF mytext \*{ REF paramcaps } }

or

{ mytext \*{ paramcaps } }

but
a. I don't know whether that wil work for all parameter types
b. it can't help if users are adding fields in the usual ways
c. as fr as I know there's no simple way to detect the language version of
Word from a field
etc.