User blog comment:Skuldomg88/Documenting the game tables/@comment-36010198-20180702042229/@comment-35937527-20180702042525

Yes, the table would get overwritten and you would have to change it again. That's why modding in this way is not practical to do. For an actual mod that can be distributed, it would have to hook into the point where the game actually reads the table and not change the table itself.

As for adding languages, that would involve other changes directly to the code. It could be done theoretically at this point, but it would involve some other changes. Also since the devs haven't said anything about how they stand in regards to modding the game, anything that involves releasing anything mod-like is at this point grey area-ish :)