sidebar.php

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<?php
$current_step = elgg_extract('step', $vars);
$steps = elgg_extract('steps', $vars);
if (empty($steps)) {
    return;
}

$current_step_index = array_search($current_step, $steps);

echo '<ol>';
foreach ($steps as $index => $step) {
    if ($index < $current_step_index) {
        $class = 'past';
    } elseif ($index == $current_step_index) {
        $class = 'present';
    } else {
        $class = 'future';
    }
    $text = elgg_echo("install:$step");
    echo "<li class=\"$class\">$text</li>";
}
echo '</ol>';

$options_values = [];
foreach (_elgg_services()->translator->getInstalledTranslations() as $key => $value) {
    $options_values[elgg_http_add_url_query_elements(elgg_get_current_url(), ['hl' => $key])] = $value;
}

echo elgg_view_field([
    '#type' => 'select',
    '#label' => elgg_echo('install:change_language'),
    'class' => 'elgg-install-language',
    'name' => 'installer_language',
    'value' => elgg_http_add_url_query_elements(elgg_get_current_url(), ['hl' => elgg_get_current_language()]),
    'options_values' => $options_values,
]);