[gtkada] problem with encoding

[Arnaud Charlet]

Gtk+/GtkAda will only deal with UTF8 strings (see in GtkAda the
UTF8_String type, which is used by most functions), so whenever you have
non ASCII (7 bit) or non UTF8 strings, you'll need to e.g. use Glib.Convert
to convert your input string into proper UTF8.

Arno