Module:fi-nominals

Are you sure that this is how people actually write things, though? An official standard doesn't mean much if nobody uses it. I'd expect that regular internetters use the normal apostrophe and not the fancy one.

Internetters do whatever is easiest without knowing right from wrong, but newspapers and book publishers use the apostrophe. I must confess that I didn't know that there's a difference until recently. I modified the templates myself - your code is clear enough to figure out what to change. I'm in the process of rooting out the printer's apostrophe from the Finnish entries.

The old apostrophe should probably be kept as a redirect, so that people using it can find things.

Not necessary. I have checked that such searches get automatically redirected.

Ah ok.