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I was able to reproduce the issue with apostrophe symbols while using the Email Newsletters App.
It seems to be caused by characters escaping caused by our web application. I have attached a bug report ticket to this thread and escalated it to our Development Team.
We will update this thread once we have any updates.
I have now fixed this problem. If you find more issues regarding this app, please do let us know.
Thanks for your patience and we apologize for this inconvenience.