Minor line fixes and more readable letters

I've fixed a couple of individual line errors and the Mother/Father sprites, which had somehow gotten swapped.

More significantly, I've added a few more page breaks so that long letters don't go off the edge of the screen in larger fonts. I can't believe it took so long for me to realise this was a problem, my apologies to anyone who missed out on part of the text!

For now, page breaks are the same regardless of font size, which means it'll look a little odd in smaller fonts. I'm going to try and come up with a more elegant solution, but my first priority is that the game is playable.