Hey! I got the same issue, i solved it by using this:

{
	module: 'newsfeed',
	position: 'bottom_center',
	config: {
		feeds: [
			   {
			   title: "Expressen",
			   url: "http://expressen.se/rss/nyheter",
			   encoding: "ISO-8859-1",
			   },
		        ],
			showSourceTitle: true,
			showPublishDate: true,
			showDescription: true,
			reloadInterval: 200000,
			updateInterval: 15000,
			animationSpeed: 3500
                  }
}, 

When i was trying with Aftonbladet, DN and my local paper, they all worked without encoding, so there must be something in Expressens feed.