Update for handle data type

[Vincent COUVERT]

Hi all,

I just updated 
http://wiki.scilab.org/Localization_in_English_-_Standard_messages so 
that messages take into account what type of handle is expected in GUI 
or GRAPHICS modules.

For exemple:
"%s: Wrong type for input argument #%d: A graphic handle expected.\n" 
(generic message)
"%s: Wrong type for input argument #%d: A 'Figure' handle expected.\n"
"%s: Wrong type for input argument #%d: An 'Axes' handle expected.\n"
...

Vincent