Nomenclature of piano terms in English, German, French, Italian, Spanish and Norsk
Here you will find an example of how a list of piano terms in a website could look http://chlemens.com/nomenclatur/ only German and English.
However it will be very much work to make this complete.
The data of this website is coming from the book Piano Nomenclatur by Nicolaus Schimmel and H.K. Herzog originally published by Bochinski and in reprint published in Italy.
The book can be bought from the AIARP: https://www.aiarp.org/prodotto/piano-nomenclatur/ . The price is € 45,00.