Fedora 25 environment failed for any strings which contained non-ASCII
characters. This made it difficult to test the Spanish version on
Fedora 25, which is where I porting the manual into Spanish.
Using wxConvISO8859_1 may prevent other languages from working, but
they probably wouldn't work anyway and the real solution is to
never convert back and forth between char * and wxString (that is,
to truely support Unicode internally).
