@yshan, humm… That’s confusing… So most strings for Rayya’s are in the Stonehearth mod and some are in the Rayya’s mod?? No way to make this more… logical? 
A suggestion :
I wasn’t expecting Rayya’s to be a separated mod but if so, why not pushing the concept a bit further? For example, all Rayya’s entities into Rayya’s mod, then duplication of the potter in both mods BUT with different recipes. In Rayya’s it’s a job as important as the carpenter in the Ascendancy. But in the Ascendancy, it’s a low level job mostly to create decorative stuff only.
THEN, creation of a special merchant coming from far away with some of Rayya’s productions BUT with different descriptions: the items that were usual in Rayya’s (like the teapot) become (with new descriptions) some extraordinary items and so, very expensive. That would add some fun, some clin d’oeil to other kingdoms making the whole thing pretty cool and more interesting. Later on (when multi player will be set) this basic feature could become a way to do business with other players, sending a merchant with stuff in over production for example.
Back on topic, I’ll test the starter mod today (btw, right now I don’t get the overrides commands; you seems to want to override files that do not exist so I have to understand how it works).
For your point 4, here a WIP fr.json 
fr.zip (66.5 KB)
Yshan, sorry to remind you this again, but before fixing new stuff, what about fixing old stuff like the few details here : 2650 - Missing string
I understand it’s not exiting but there is no reason to report anymore if things get lost in time… 