How to translate a structure url
Since the URL is specific for each multisite, simply do not use section.handle in the structure's URI definition, but go for the term you want as a string instead, e.g.

English: {parent.uri ?? 'products'}/{slug}
German: {parent.uri ?? 'produkte'}/{slug}
French: {parent.uri ?? 'produits'}/{slug}

and so on...