I send you the files of the link and form extension.
The Link OR Form extension had only es_ES bestanden, while the other showed several language files. I don’t know anymore which of the two.
I have changed the es_ES file to a nl_NL file and trnaslated some elements in it.
The only problem is that in the Dashboard menu/users i see an item in Spanish: “Su ficha en el directorio” and that is not what i want.