This comes from a discussion on WP:fr focus on switch from the Vertical typewriter apostrophe ( ' ) to the typographic apostrophe ( ’ ) in titles or texts
We need, if the discussion succeeds to switch to title with typographic apostrophe, that the autocompletion treats as equivalent all apostrophes like : http://en.wikipedia.org/wiki/%27#Computing or http://fr.wikipedia.org/wiki/Apostrophe_(typographie)#En_informatique
Example in WP:de http://de.wikipedia.org/wiki/L’École_des_filles
completion works with: l’ecole (typographic apostrophe) but doesn't work with: L'École (vertical apostrophe)
This also is needed for the autocompletion process in the help box when you add a internal link when you are contributor.