I have a cookbook with recipes in it. I can consistently see the cookbook, pick it up, and read it.
However, two other characters could not consistently see or pick up the cookbook. (As a note, the recipes are at least partially in Lapin. I only see the Lapin label on the left side pages, but it's possible the right side pages are also in Lapin)
One other character, who knows Lapin, can pick it up. However, sometimes they can read the recipes, and sometimes it acts as though it's a piece of paper that they cannot read recipes from.
Another character, who does not know Lapin, can sometimes not pick it up or see it in the world. They did once pick it up, but it acted as though it was completely empty with no pages.
Edit: I tested with more players, none of whom are fully fluent in Lapin. The behavior is extremely inconsistent. They also mentioned it sometimes duplicates itself; I have never personally witnessed duplication, and the book always appears to only be in one place to me.