So, I've founded where was my problem

The 1and1 package I've chosen first doesn't accept the pho language, but only the html...
It's the same for few 1and1 package.

Moreover, I've discover in the same time that in this package, no SQL database could be created...

After an account upgrade, the installation has correctly been completed, and I'm configuring the online shop.

Cheers !

Bastien.