languages.php

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<?php
$language = $vars['language'];
$lastcache = elgg_extract('lc', $vars, 0);

// @todo add server-side caching
if ($lastcache) {
    // we're relying on lastcache changes to predict language changes
    $etag = '"' . md5("$language|$lastcache") .  '"';

    header('Expires: ' . gmdate('D, d M Y H:i:s \G\M\T', strtotime("+6 months")), true);
    header("Pragma: public", true);
    header("Cache-Control: public", true);
    header("ETag: $etag");

    if (isset($_SERVER['HTTP_IF_NONE_MATCH']) && trim($_SERVER['HTTP_IF_NONE_MATCH']) === $etag) {
        header("HTTP/1.1 304 Not Modified");
        exit;
    }
}

$all_translations = elgg_get_config('translations');
$translations = $all_translations['en'];

if ($language != 'en') {
    $translations = array_merge($translations, $all_translations[$language]);
}
?>
define(<?php echo json_encode($translations); ?>);