https://bugzilla.wikimedia.org/show_bug.cgi?id=55303
--- Comment #1 from Kunal Mehta (Legoktm) legoktm.wikipedia@gmail.com --- I was asked by User:V85 to find a solution for that. ... see http://de.wiktionary.org/wiki/Benutzer%5C_Diskussion:Melancholie%5C#Interwik... The whole thing with those apostrophes is disputed, though. ... please read http://en.wiktionary.org/wiki/User%5C_talk:Robert%5C_Ullmann%5C#Probleme%5C_...
My bot is currently accepting both typographical variants of apostrophes and is ignoring some other typographical differences as well.
See http://de.wiktionary.org/w/index.php?title=User:MelancholieBot/interwiki.py&... for a potential patch.