LabyrinthAP/includes/locale.php

<?php

/**
* Sets locale information for i18n support
*
*/


/** 
* Rudimentary language detection via the browser.
* Accept-Language returns a list of weighted values with a quality (or 'q') parameter.
* A better method would parse the list of preferred languages and match this with 
* the languages supported by our platform.
*
* Refer to: https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.4
 */
if (empty($_SESSION['locale']) && strlen($_SERVER['HTTP_ACCEPT_LANGUAGE']) >= 2) {
  $lang = substr($_SERVER['HTTP_ACCEPT_LANGUAGE'], 0, 2);
  switch ($lang){
    case "de":
      $locale = "de_DE.UTF-8";
      break;
    case "fr":
      $locale = "fr_FR.UTF-8";
      break;
    case "it":
      $locale = "it_IT.UTF-8";
      break; 
    case "pt":
      $locale = "pt_BR.UTF-8";
      break;
    case "sv":
      $locale = "sv_SE.UTF-8";
      break;
    case "nl":
      $locale = "nl_NL.UTF-8";
      break;
    case "zh":
      $locale = "zh_CN.UTF-8";
      break;
    case "cs":
      $locale = "cs_CZ.UTF-8";
      break;
    case "ru":
      $locale = "ru_RU.UTF-8";
      break;
    case "es":
      $locale = "es_MX.UTF-8";
      break;
    case "fi":
      $locale = "fi_FI.UTF-8";
      break;
    case "si":
      $locale = "si_LK.UTF-8";
      break;
    default:  
      $locale = "en_GB.UTF-8";
      break;
  }

  $_SESSION['locale'] = $locale; 
}

// Note: the associated locale must be installed on the RPi 
// Use: 'sudo raspi-configure' and select 'Localisation Options' 

// activate the locale setting
putenv("LANG=" . $_SESSION['locale']);
setlocale(LC_ALL, $_SESSION['locale']);

bindtextdomain(LOCALE_DOMAIN, LOCALE_ROOT);
bind_textdomain_codeset(LOCALE_DOMAIN, 'UTF-8');

textdomain(LOCALE_DOMAIN);