’ instead of ' (apostrophe) in Print-friendly display

[corrigentia]

OS: Lubuntu 18.04 (latest Ubuntu Long-Term Support with the LXDE Desktop Environment)
Web Browser: Waterfox 56.2.3 (64-bit) [fork of Mozilla Firefox with support for deprecated extension architecture]

Steps to reproduce:

http://www.stencyl.com/help/viewArticle/119
Scroll down to the 3 blue buttons > Print Article

right-click > View Page Info > Text Encoding: windows-1252 / Render Mode: Quirks mode