So it's a chicken and egg thing.  I just want to avoid landing this and having it go to prod while the strings are actually in.  It might make sense to merge these other bugs into this one so it all happens at once.  Either that or maybe we land the `locale/en_US/messages.json` first, with all the strings, then do this bit last.  I'm open to whatever works, so long as we don't break prod, and once this lands, it's hard to avoid that.