That's wonderful!! The Sweedish translation was one of our missing languages for JEvents 1.5.5
The easiest way for you is sending me the files to my email address(cmcamara [Change this for the at symbol] gmail.com).
If you want to create the package yourself, you have to create the structure of the compressed files and the xml file as in other packages. You can find the 1.5.4 package here:http://www.jevents.net/en/downloads/cat ... ranslation
It may be a good reference ;o).
I wait for your answer