$ sudo apt-get update
$ sudo apt-get install dict-freedict-eng-swe 

dict-freedict-eng-swe is installed in your system.

Make ensure the dict-freedict-eng-swe package were installed using the commands given below,

$ sudo dpkg-query -l | grep dict-freedict-eng-swe *

You will get with dict-freedict-eng-swe package name, version, architecture and description in a table

dict-freedict-eng-swe package basic information: