It looks like apostrophes aren't being displayed properly in the Digital Features - I've seen this in Chrome on Ubuntu and on Android.
I'm not sure how you generate the text for html, but it looks like it's probably an encoding issue. I note that there's no meta tag specifying the character set in the html source, that could probably fix it.
Thanks for reporting it. There's a bug caused by curly Mac OS apostrophes somewhere in the build script. Re-generating the HTML for the slides in the feature fixes it. A look into a proper fix for this is on the To Do list but as it's not urgent gets keeps getting bumped down.