Thank you for getting back to me.
If I take a look in terminal, I see untranslated folder names:
`Desktop Documents Downloads Dropbox Music Pictures Public Templates Videos``
locale -a
gives:
C
C.UTF-8
en_US.utf8
nl_NL.utf8
POSIX
I'm not sure what would be the "normal" output for locale -a.
In the language settings screen I've got "Dutch" as default and first entry; "American English" as the second.