Problem: External links that do not link to https pages currently show the same icon as links to e.g. pdf's, either in the reference section or in the external links section. The reader should be aware that clicking on the link will result in downloading a document or open a reader or other program, rather than evoke a webpage. Especially PDF's may be large files.
Proposed solution: implement CSS resembling the en-wiki. May include docs like Word and Excell.