The proper "smart quotes" (i.e., not just oriented quotation marks, but with the ability of detecting the language and quotation level) rely, as far as I know, on the ":before" and ":after" pseudo-classes and "content" property of CSS. I'm not sure these are supported in the ePUB specification, I believe they aren't.
Besides, there is still the "issue" with multi-paragraph quotes, I don't think it's possible to define how they should behave with CSS... So, I decided to forget about the "smartiness" and instead just use the proper character (or entity) in each place.
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