Translation WITHIN Wikipedia is a diffferent matter from translation under the GNU FDL.  Contributors are implicitly giving additional permission (beyond the GNU FDL) to allow for the normal operation of the website under our longstanding traditions.  So this means that while attribution is a courtesy, it is done for internal policy reasons and this has NOTHING to do with the GNU FDL.  I do not think it is wise to have permanent links between versions in the actual article space, a mention in the edit summary is more than enough.