So it should be a title normalisation rule enabled depending on content language?
What about existing conflicts?

Indeed, I suppose this normalization may be undesirable for some language.

For existing conflicts, I see two cases:

• one of the both page redirects to the other one → the redirection should be removed
• none is a redirect (I suppose it’s a rare case, but I haven’t any stat) → one (probably the one with curly apostrophe) should be renamed and categorized inside a specific maintenance category

Ideally, community should have the list of concerned conflicts (especially second case ones) to handle them before making titles equivalent.