These are publically editable files, so that you can easily create a fork for mission changes etc.
All missions are found in the missions folder, and then region.
The link files specify the requirement and vehicle id. So, if it can't see a requirement you'll need to make an edit in there.
There's a server running the json files- by using the json file found in the generator folder, you can easily add words to include, exlude and words to replace with nothing. The json is fairly simple to understand. Giving you full control of any wrong words in the generated json files.