[Resolved] Filter by language does not work for activity feed

// Filter the activity feed by the language:
// 1. buffer the activity entry output...
add_action('bp_before_activity_entry', function () {
	ob_start();
});
// 2. clean the output if the activity is the post activity and languages don't match,
//    flush otherwise.
add_action('bp_after_activity_entry', function () {
	$get_lang = $_GET['lang'];
	$language_code = get_activity_post_language_code();
	if ( $language_code && $get_lang && $language_code !== $get_lang ) {
		ob_end_clean();
	} else {
		ob_end_flush();
	}
});

function get_activity_post_language_code() {
	if ( ! bp_get_activity_secondary_item_id() ) {
		return false;
	}

	$language_details = apply_filters( 'wpml_post_language_details', NULL, bp_get_activity_secondary_item_id() );
	if ( ! $language_details ) {
		return false;
	}

	return $language_details['language_code'];
}