WPML: how to show places in default language when translation is missing

All that I found is the switch that decides if places get translated or not.
In both options, the listings only display places with the current languages.

I tried both settings, but got the same result: it only shows places in the current language and nothing if there is no translation for the current language.

What I found out so far, is that there is a setting called “Blog posts to display” that does exactly what I need, but only for blog posts and not for other post types. As I understand, it would require custom coding for other post types.

Here I found an example for that:

http://wpml.org/forums/topic/custom-post-type-content-from-default-language-to-display-in-2nd-language/

/* WPML
 * Display default content on missing languages
 */
add_filter('icl_ls_languages', 'wpml_ls_filter');
 
function wpml_ls_filter($languages) {
    global $sitepress;
 
    $default_url = $languages[$sitepress->get_default_language()]['url'];
    foreach($languages as $lang_code => $language){
        if($languages[$lang_code]['missing']==1){
            $languages[$lang_code]['url'] = $default_url;
        }
    }
return $languages;
} 

But in that form it does not work.
Maybe I need to attach it to another hook?

Or would some customization of the query like in that thread be needed?

The guys over there are asking for the code that displays the posts.
I think it is code in geodirectory-functions/listing_filters.php, but I am not sure about that. Could you please point me to the correct location?