title.php

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<?php
$title = elgg_extract('title', $vars, '');
if ($title === false) {
    return;
}

$relationship = elgg_extract('relationship', $vars);
if ($title === '' && $relationship instanceof ElggRelationship) {
    $entity_one = get_entity($relationship->guid_one);
    $entity_two = get_entity($relationship->guid_two);
    if (empty($entity_one) || empty($entity_two)) {
        return;
    }
    
    $key = false;
    $keys = [
        "relationship:{$relationship->relationship}",
        'relationship:default',
    ];
    foreach ($keys as $try_key) {
        if (elgg_language_key_exists($try_key)) {
            $key = $try_key;
            break;
        }
    }
    
    if (!empty($key)) {
        $title = elgg_echo($key, [elgg_view_entity_url($entity_one), elgg_view_entity_url($entity_two)]);
    }
}

echo elgg_format_element('div', ['class' => [
    'elgg-listing-summary-title',
]], $title);