Asking for the existence of a particular Judaism book is about Judaism and therefore certainly on-topic.
This is, sort of, a special case of asking for the existence of X within Judaism, which is discussed in this previous Meta post. The community consensus seems to be currently that such questions are fine even without clear motivation, though motivation would be good to include. In this case, if the question explains that there's a version of this book in language X but the asker would like to study it in language Y, that sounds like a pretty good motivation to me.
That said, if a user were to, say, take a list of commentaries on the Talmud and methodically post one trivial question for each one asking if it exists in English, flooding the front page with such questions, that could be something the moderators would ask the user to stop or at least rate-limit, so as not to abuse the front page.