I've had similar questions until I read
this wiki at forge.joomlapolis.com/projects/lan-cb/wiki
, which is rather self-explanatory.
So, there you should find that as far as your Swedish CB plug-in structure is concerned, all you need to do is just to amend the language.xml file, with no file name changes needed.
Translation wise, all you have to do in the mentioned by the wiki files to be translated is to translate the right-hand side part of the language stings, which is the part after the => character.
Hope this helps