Translate the following English sentence to French:
"Finally, our proposal will help to reduce considerably the costs of patents in Europe by not requiring supplementary translations of the patent once it has been delivered in one of the three languages of the European Patent Office."
Enfin, notre proposition permettra de réduire considérablement les frais de brevetage en Europe, car elle évite des frais de traduction supplémentaires en limitant le nombre de langues aux trois langues de l'Office européen des brevets.