Drupal 7 - Page alter

template.php

function THEMENAME_preprocess_page(&$vars) {

   // Change site name based on language
  global $language;
  $userlanguage = $language->language;
  switch ($userlanguage) {
    case 'en':
    case 'uk':
    case 'ie':
      $vars['site_name'] = t('Partner Marketing Materials');
      break;
    case 'fr':
      $vars['site_name'] = t('Documentation de partenaire de marketing');
      break;
  }

}