I've published a course in 12 languages and customized the goodbye.html page for each language. In each of the languages that have special characters, these character appear as a ? mark, in my LMS. When I view the published goodbye.html it shows the special characters correctly. However, after testing in the LMS, they appear as question marks.
My LMS, Cornerstone on Demand, has tested this also and says this is an Articulate issue. I have corrected the significantly frustrating task of having to manually correct the title (Articulate, can you just fix this please?), but don't seem to be able to apply that same fix to the custom goodbye.html.