The source project of this merge request has been removed.
If the Kart Krew Discord #tech-support channel is any indication, people get crushed by addon confusion really, really often. It's either well-meaning people who expect the game to be able to handle partial file lists / addons loaded in the wrong order, or people who legitimately can't understand the errors at all—or think they can't understand them, and don't even bother to read them. (This is depressingly common.)
These versions of the affected messages use plainer language, and they include really unambiguous instructions for how to make them go away. They're slightly less precise—for instance, they totally ignore the case where you're trying to rejoin a netgame you were just booted from—but I couldn't find any wording that included that case and wouldn't bloat the message or confuse people. I think an unnecessary restart is a better failure mode than people completely failing to join netgames.