A very important paragraph summing up lots of ArM5 rules for Mortimer's spells is TME p.99f Magic Can Neither Read Nor Understand, especially:
Words on a page are under the purview of the Form relating to the components of the ink used (mostly Herbam and Terram), or the page itself (Animal for parchment, other Forms for different media). Manipulating the words however gets no sense of the meaning therein. There is, for example, a profound lack of a spell that can translate the written word from one language to another, even though there is a spell that translates the spoken word in exactly this manner. This is because the mind that uttered a word can be interrogated for its meaning with Mentem magic, but written words are just artifices of ink and parchment that have no intrinsic thoughts behind them.
This excludes spells like Emergence of the Sleeping Knowledge and Question to the Invisible Librarian.
Turning a book into an Animae Faerie for some time with a MuAn (He) Animae Magic (HoH:MC p.94) spell is certainly possible. Such Faeries might acquire the Pretenses (RoP:F p.62ff) of Speak Latin and Artes Liberales over time in a library.and afterwards "read themselves". That could indeed be fun - but might be slower and less useful than having a magus' or scribe's apprentice sift through that book and give the magus a summary.