I installed my own copy of phpmyadmin on my server and I've noticed quite a few changes on the main page itself. First this message at the bottom
And a lot more language options.
I can also create databases from the main panel of my own installation which is a bug probably, since they possibly don't want us to create our own databases without using their system *-).
Anyway, if you install your own phpmyadmin, it seems you can select the language, the mysql charset, the mysql connection collation and also create new databases with your own charset.... I forgot my user names/passwords for the 'official' myadmin panel so I can't tell if you can do this now anyway...
As for you ??? problem, I guess that if it converted the encoding and you tried to convert it back, you will be stuck with the ???. I'm not sure how it works, but I'd guess if it couldn't find the right value for the encoding in swedish, it's just replace it with the real value for ?. Maybe you can restore from a backup?