User:Solumeiras/Interwiki sandbox

From the above experiment, interwiki links display as (whatever the project link): http://en.wikipedia.org/wiki/PROJECT PREFIX
 * fr:w:Utilisateur:Solumeiras
 * fr:b:Utilisateur:Solumeiras
 * de:q:Benutzer:Solumeiras
 * de:n:User:Solumeiras
 * en:n:User:Solumeiras

e.g.: http://en.wikipedia.org/wiki/fr:q:Utilisateur:Solumeiras

Why does the interwiki do it this way??