Updated po files from source changes.

Reordering the source files resulted in line numbers being changed in
the po files by gettextize.  Forgot to include these with the sources.
Have configure generate Xdx.desktop now

Xdx.desktop had two hard coded paths.  Now have configure substitute the
prefix of installed paths.

The values for the Categories key was not terminated in a ';'.  Thanks
to Tom Beierlein, DL1JBE, for pointing this out.