ok, I've taken english out.  About it being the preferred / common selection.  I suppose we could drop this cautionary note; its just that i was afraid that at some point in the future the document conversion process might be supplying some  media files that the rewrite functions don't handle now, so thought to keep the cautionary note in the case where pkp-udev.lib.sfu.ca was producing content that the plugin (at least installed version) couldn't handle.  Alex, thoughts?