#994500 by Gábor Hojtsy: Fixed Drupal should not require .po file rename in installation

INSTALL.txt

@@ -91,8 +91,7 @@ INSTALLATION
    - Download a translation file for the correct Drupal version and language
      from the translation server: http://localize.drupal.org/download
 
-   - Rename the downloaded file to your language's ISO code (e.g., de.po or
-     fr.po) and place it into your installation profile's translations
+   - Place the file into your installation profile's translations
      directory. For instance, if you are using the Standard install profile,
      move the .po file into the directory:
 

includes/install.core.inc

@@ -1120,6 +1120,10 @@ function install_select_profile_form($form, &$form_state, $profile_files) {
 function install_find_locales($profilename) {
   $locales = file_scan_directory('./profiles/' . $profilename . '/translations', '/\.po$/', array('recurse' => FALSE));
   array_unshift($locales, (object) array('name' => 'en'));
+  foreach ($locales as $key => $locale) {
+    // The locale (file name) might be drupal-7.2.cs.po instead of cs.po.
+    $locales[$key]->langcode = preg_replace('!^(.+\.)?([^\.]+)$!', '\2', $locale->name);
+  }
   return $locales;
 }
 
@@ -1145,8 +1149,8 @@ function install_select_locale(&$install_state) {
 
   if (!empty($_POST['locale'])) {
     foreach ($locales as $locale) {
-      if ($_POST['locale'] == $locale->name) {
-        $install_state['parameters']['locale'] = $locale->name;
+      if ($_POST['locale'] == $locale->langcode) {
+        $install_state['parameters']['locale'] = $locale->langcode;
         return;
       }
     }
@@ -1164,14 +1168,6 @@ function install_select_locale(&$install_state) {
           $output = '<p>Follow these steps to translate Drupal into your language:</p>';
           $output .= '<ol>';
           $output .= '<li>Download a translation from the <a href="http://localize.drupal.org/download" target="_blank">translation server</a>.</li>';
-          $output .= '<li>Rename the downloaded file retaining only the language code at the end of the file name and its extension. For example, if the file name is
-<pre>
-drupal-7.0.pt-br.po
-</pre>
-rename it to
-<pre>
-pt-br.po
-</pre></li>';
           $output .= '<li>Place it into the following directory:
 <pre>
 /profiles/' . $profilename . '/translations/
@@ -1237,16 +1233,15 @@ function install_select_locale_form($form, &$form_state, $locales, $profilename)
   include_once DRUPAL_ROOT . '/includes/iso.inc';
   $languages = _locale_get_predefined_list();
   foreach ($locales as $locale) {
-    // Try to use verbose locale name.
-    $name = $locale->name;
+    $name = $locale->langcode;
     if (isset($languages[$name])) {
       $name = $languages[$name][0] . (isset($languages[$name][1]) ? ' ' . st('(@language)', array('@language' => $languages[$name][1])) : '');
     }
-    $form['locale'][$locale->name] = array(
+    $form['locale'][$locale->langcode] = array(
       '#type' => 'radio',
-      '#return_value' => $locale->name,
-      '#default_value' => $locale->name == 'en' ? 'en' : '',
-      '#title' => $name . ($locale->name == 'en' ? ' ' . st('(built-in)') : ''),
+      '#return_value' => $locale->langcode,
+      '#default_value' => $locale->langcode == 'en' ? 'en' : '',
+      '#title' => $name . ($locale->langcode == 'en' ? ' ' . st('(built-in)') : ''),
       '#parents' => array('locale')
     );
   }

includes/install.inc

@@ -1068,11 +1068,16 @@ function st($string, array $args = array(), array $options = array()) {
   if (!isset($locale_strings)) {
     $locale_strings = array();
     if (isset($install_state['parameters']['profile']) && isset($install_state['parameters']['locale'])) {
-      $filename = 'profiles/' . $install_state['parameters']['profile'] . '/translations/' . $install_state['parameters']['locale'] . '.po';
-      if (file_exists(DRUPAL_ROOT . '/' . $filename)) {
+      // If the given locale was selected, there should be at least one .po file
+      // with its name ending in {$install_state['parameters']['locale']}.po
+      // This might or might not be the entire filename. It is also possible
+      // that multiple files end with the same extension, even if unlikely.
+      $po_files = file_scan_directory('./profiles/' . $install_state['parameters']['profile'] . '/translations', '/'. $install_state['parameters']['locale'] .'\.po$/', array('recurse' => FALSE));
+      if (count($po_files)) {
         require_once DRUPAL_ROOT . '/includes/locale.inc';
-        $file = (object) array('uri' => $filename);
-        _locale_import_read_po('mem-store', $file);
+        foreach ($po_files as $po_file) {
+          _locale_import_read_po('mem-store', $po_file);
+        }
         $locale_strings = _locale_import_one_string('mem-report');
       }
     }