Save the following /etc files to try this solution:
echo 'keymap="swedish.iso.acc"' >>/etc/rc.conf
sed -i .bak '/cons25/s/cons25/cons25l1/' /etc/ttys
Does swedish use ISO-8859-1 ?
The "l1" above corresponds to this.
Then add the following line
":charset=ISO-8859-1:\" somewhere after "default:" in /etc/login.conf and run "cap_mkdb /etc/login.conf"
To see the manpages in your language set and export the LC_ALL environment variable.