Hey, have found a way to get the wikitionary (and some other wiki related dumps) onto wedict but the source for the files said that the wikipedia dump was too big to work with. Download the files here
http://www.stardict.org/wikipedia/
then extract the file with 7zip, you get a TAR file, extract that with 7zip, you get a folder, extract the .DZ file in that folder. then copy the .dict and the .idx file to the wedict directory. This will take some time. When you open wedict and select the dictionary and your first search it will take some time. I think this is because the application is creating the .idxc file. After that initial search it speeds up dramatically.