I don't think there is a way to use the <<actions>> macro with text that includes both " and ' characters. It's not hard to imagine a situation where this would be useful: suppose one of the choices is to speak a line of dialogue, which requires ", and inside the dialogue is a contraction, which requires '. I found that, while the editor's syntax highlighting seems to understand escapes such as \", the game engine itself does not -- at least, not in this context.
Comments
If you're not using SugarCube, then I'm sure the vanilla headers will get updated for this sooner or later.
http://www.ascii.cl/htmlcodes.htm
e.g.
" --> "
' --> '
Makes reading the code annoying, I realize, but it's an option.