Thoughts about quotation marks
Quotation marks in literature are used differently depending on where you are and for which country you write it. See https://en.wikipedia.org/wiki/Guillemet Roman languages: «Hello world» Northern languages, like German: »Hello World« But there are also other variants: https://en.wikipedia.org/wiki/Quotation_mark
I would suggest that the user defines in editor settings, which quotation marks should be used, enters his text with traditional quotation marks " or ' and bibisco cares about them.
I, as a German, have issues with the buttons in roman order: « » First I thought they have to be in the other way around. Thinking longer about that I would prefer, not to be forced to use them. Entering novel text should be as undisturbed as possible. I want to stay in the flow...