hestiacp/web/inc/i18n.php

<?php
// Functions for internationalization
// I18N support information here

putenv("LANGUAGE=" . detect_user_language());
setlocale(LC_ALL, "C.UTF-8");

$domain = "hestiacp";
$localedir = "/usr/local/hestia/web/locale";
bindtextdomain($domain, $localedir);
textdomain($domain);

/**
 * Detects user language from Accept-Language HTTP header.
 * @param string Fallback language (default: 'en')
 * @return string Language code (such as 'en' and 'ja')
 */
function detect_user_language() {
	if (!empty($_SESSION["language"])) {
		return $_SESSION["language"];
	} elseif (!empty($_SESSION["LANGUAGE"])) {
		return $_SESSION["LANGUAGE"];
	} else {
		return "en";
	}
}
/**
 * Translate ISO2 to "Language"
 * nl = Dutch, de = German
 * @param string iso2 code
 * @return string Language
 */
function translate_json($string) {
	$json = file_get_contents($_SERVER["DOCUMENT_ROOT"] . "/locale/languages.json");
	$json_a = json_decode($json, true);
	return $json_a[$string][0] . " (" . $json_a[$string . "_locale"][0] . ")";
}
/**
 * Detects user language .
 * @param string Fallback language (default: 'en')
 * @return string Language code (such as 'en' and 'ja')
 */

function detect_login_language() {
}