with I18N: the side-name(s) for the startpage(s) not delivered

[Belletage]

so, the situation:
it seems to be not a multilanguage-GS-Problem nor
an .htaccess-Problem, but an I18N-Problem, that brings with
my GS-Configuration, with %nondefaultlanguage%/%slug%.html, out of

Code:

get_i18n_navigation(return_page_slug(FALSE),0,5);

and

Code:

return_i18n_setlang_url('en');

for the particular startpages not a name, like 'index',
but leaves it empty, so that there is
just an slug/.html output possible.
right?
Bell.