OMFG
I followed your link, there is talk about two different apostrophes (U+02BC and U+2019).
U+2019 is the same as Shift + Alt Gr + B on my keyboard. U+02BC is not even one of the 5 different apostrophes I found so far on my keyboard. 
I get that different regions with different languages developed different signs for similar things in the past, but why do we still have 6 (or more?) versions left today?
It’s not like anyone can tell the difference between ʼ and ’ without a magnifying glass anyway.
Anyways, Shift + Alt Gr + B “right-single-quotation-mark” = U+2019 = ’ should be the “correct” one (for now) right?