How to render a menu_block in a specific language (i18n)
ok - this is extremely ugly, but seems to work

global $language,$language_content;
$org_language = $language;
$language = $language_content;
$block = module_invoke('menu_block', 'block_view', IAF_BOOKLETS_MBID);
$language = $org_language;

print render($block['content']);


Feel free to boo me on this one :-D