Never mind my last message. Here's my attempt at a proper /var/lib/dictionaries-common/aspell/aspell-sv:
Language: svenska (Svenska) Hash-Name: sv Emacsen-Name: svenska Coding-System: iso-8859-1 Casechars: [A-Za-zÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ] Not-Casechars: [^A-Za-zÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ] Otherchars: [']
