Support for multilanguage sites, Internationalization (I18N)

[Connie]

I jump on this because I have to do a bilingual site, but the english content is not shown

I did like this:
GS 3.0 (most actual version)
I18N-plugins downloaded (most actual version) and installed
in Cardinal-theme :

Code:

<?php get_i18n_navigation(return_page_slug(),0,100); ?> and
<?php get_i18n_component('sidebar'); ?>

slugs are set to:

Code:

index.php?id=%slug%

no URL rewrite

language is defined in gsconfig.php to de_DE
pages are created and seen in the i18N-View

Code:

RewriteEngine off

in .htaccess

but the pages are not loaded, even when I enter the link directly in the URL adressbar:
http://free-jazz.de/index.php?id=kontakt&lang=en

the german version is loaded all the time, no language switch

did I miss something?