Damn, I could have sworn the job was programming and developing a working, and fun game. I guess it's actually slaving over whether they wrote a word slightly wrong, or made a very difficult to catch typo somewhere.
And yeah, I remember when "Off Course" broke FF7 for me, so much fun could have been had playing it, but then I read that typo, and lost my fucking mind. It ruined the experience man. Or that time I played Mega Man 6, I had to stop playing because Wily/Mr.X said "Faild" instead of "Failed", it broke the game, man. Then there was that time I actually beat Ghosts and Goblins, only to have my moment RUINED by "Congratulation" and "Happy End", all that sense of accomplishment doing what few gamers would ever do? Gone, because typo, it broke the experience.
Again, I'm NOT saying this is of ZERO importance, but you are making Mount Everest out of a back yard clump.
And yes, people DO joke about these things, but what they DON'T do, is rage quit the game, and talk about how it ruined their experience. Or, at least, so few do it as to not be worth worrying about. And they're far worse typos than what you're complaining about.