Improve compatibility with more versions of LaTeX2HTML and more LaTeX

markup.  Not currently needed, but easier to save this now than to
have to figure it out when we do.

Doc/perl/python.perl

@@ -89,6 +89,7 @@ sub do_cmd_let{
 sub do_cmd_textasciitilde{ '~' . $_[0]; }
 sub do_cmd_textasciicircum{ '^' . $_[0]; }
 sub do_cmd_textbar{ '|' . $_[0]; }
+sub do_cmd_texteuro { '€' . $_[0]); }
 sub do_cmd_textgreater{ '>' . $_[0]; }
 sub do_cmd_textless{ '<' . $_[0]; }
 sub do_cmd_textunderscore{ '_' . $_[0]; }