Hello Dom,
For the translation of your book into the languages French, Italian, German and Spanish, I can recommend the translation agency "AP Fachübersetzungen" based in Nuremberg, Germany. I have been working with this company for some time and I found them to be very reliable, fast, and their translations to be of high quality. They do specialise in medicine, pharmacy, technology and law, but they translate general and marketing texts as well. Here's the link to their English website: https://www.ap-fachuebersetzungen.de/en/
I hope this will help you!
Best regards,
Language lover