[Mediterraneo10]

PDF actually has support for language tagging, and using it is a recommended part of any guide to accessibility for the visually impaired.

It may be that the language which a quoted foreign-language word is meant to read in was mentioned far back in the text. Human sighted readers will know how to read it, but computers won't yet (and perhaps won't for many years if not decades). However, there are visually impaired people now who need to be guaranteed the same Gemini experience as sighted users.