Thank You Dryabov but i think that is caused by somethings reffered to the language because if I put directly on the browser
www.vitalibruno.com/en (that is the address that appeared before the installation of sh404ref on using a mobile device) it appears with the right mobile joomla template.
Indeed, to let sh404sef woks, I had to put off the joomla plugin "System language filter" and switch on the language control on sh404.
But it seems to not work as the original plugin or sh404 rewrite the address in a wrong way.
All my modules on mobile joomla are in english language.