What is the proper template-tag way to decode/encode "smart" quotes and apostrophes from RSS feeds that get translated to (I think) odd unicode characters?
E.g.: quotation marks and apostrophes that get changed to things like this: ’s “,†.
Reported on Movable Type 4.25

That means bad encoding and it is not fixable via decoding special characters...
Thanks. So is there a way to do it through MT outside of the normal decode/encode template-tag modifiers?
So if you add inside movable type a curly quote, but on your Web page it is changed into garbage characters like the ones you've listed above I would imagine that while your movable type admin is set to the UTF-8 charset, either your template refers to ISO, or the server is imposing an ISO charset for all your site files.
You could fix both scenarios, by either editing the template and having the charset as UTF-8, or patching .htaccess and imposing the UFT-8 charset like:
Content-Type: text/html; charset=utf-8
Thanks. Changing the charset in the header through a meta tag fixed the problem.
You're welcome!