How do I translate the books?

I have 3 books in Latin (marked in red in the next picture).

I already googled around and the most useful information I found is this one but it doesn't say where to find what I need to translate the books.

On that link I posted there are two instructions:

Generally, languages may be learned in one of two ways:

Reading a primer on that language, or Studying the language with a being that has Aspect: Tutor in that language.

• Where do I find that Tutor?
• How do I find that primer on a specific language?
• Is there another way to translate it?