.htaccess mod_rewrite website structure

We need mod_rewrite for the .htaccess file. The following structure has to be achieved:

www.domain.com
www.domain.com/page-1
www.domain.com/directory-1/
www.domain.com/directory-1/page-1

www.domain.com/gb/
www.domain.com/gb/page-1
www.domain.com/gb/directory-1/
www.domain.com/gb/directory-1/page-1

www.domain.com/de/
www.domain.com/de/page-1
www.domain.com/de/directory-1/
www.domain.com/de/directory-1/page-1

Where:
gb/de is language/location
page-1 is a webpage
directory-1/ is a directory/folder and should be accessed by its own index.php file


The mod_rewrite should look like something like:
RewriteRule ^([^/]+)/?$ index.php?id=$1 [NC,L]
RewriteRule ^([^/]+)/([^/]+)/?$ index.php?id=$1&directory=$2 [NC,L]