New bonus skill recommendation
I have finished the French tree and see that there is an empty slot for a bonus skill. My recommendation is to add a slang section. I suppose this would be similar to idioms, but less formal. I think that would be quite helpful to prospective travelers.
Even if you don't want to use slang, it's useful to know it, so you're not gulping like a goldfish going "whathesay? whathesay?" when someone else does! For instance, I recently learned to understand the slangy "tu vois ce que je veux dire" (pronounced "tu vois skujveuxdire" - equivalent to ya-know-what-I-mean-like. It's considered a fairly déclassé thing to say, but now I know what people are saying when they say it.