diff -urpN --strip-trailing-cr ../drupal-6.x-dev/files/README.txt ./files/README.txt
--- ../drupal-6.x-dev/files/README.txt	1970-01-01 01:00:00.000000000 +0100
+++ ./files/README.txt	2007-11-11 16:20:42.000000000 +0100
@@ -0,0 +1,13 @@
+// $Id:    $
+
+This is the default directory used for all your uploaded files,
+as well as some temporary files created by Drupal. It is highly
+recommended to consider whether this location is matching your needs,
+especially if you are going to run multiple sites from the same
+codebase, and adjust the setting at admin/settings/file-system
+accordingly before uploading any files to your new site. After
+doing so, you will be able to remove this directory, if no more
+in use. Changing the setting later might cause problems.
+
+Since this directory is used while installing Drupal, you need
+to make it writable, before you can start the installation.
diff -urpN --strip-trailing-cr ../drupal-6.x-dev/includes/bootstrap.inc ./includes/bootstrap.inc
--- ../drupal-6.x-dev/includes/bootstrap.inc	2007-10-25 17:38:24.000000000 +0200
+++ ./includes/bootstrap.inc	2007-11-11 16:22:19.000000000 +0100
@@ -1083,7 +1083,7 @@ function language_list($field = 'languag
  *   Optional property of the language object to return
  */
 function language_default($property = NULL) {
-  $language = variable_get('language_default', (object) array('language' => 'en', 'name' => 'English', 'native' => 'English', 'direction' => 0, 'enabled' => 1, 'plurals' => 0, 'formula' => '', 'domain' => '', 'prefix' => '', 'weight' => 0));
+  $language = variable_get('language_default', (object) array('language' => 'en', 'name' => 'English', 'native' => 'English', 'direction' => 0, 'enabled' => 1, 'plurals' => 0, 'formula' => '', 'domain' => '', 'prefix' => '', 'weight' => 0, 'javascript' => ''));
   return $property ? $language->$property : $language;
 }
 
diff -urpN --strip-trailing-cr ../drupal-6.x-dev/includes/form.inc ./includes/form.inc
--- ../drupal-6.x-dev/includes/form.inc	2007-11-09 08:40:55.000000000 +0100
+++ ./includes/form.inc	2007-11-11 16:22:19.000000000 +0100
@@ -565,6 +565,9 @@ function drupal_redirect_form($form, $re
  *   theming, and hook_form_alter functions.
  */
 function _form_validate($elements, &$form_state, $form_id = NULL) {
+  // Also used in the installer, pre-database setup.
+  $t = get_t();
+  
   // Recurse through all children.
   foreach (element_children($elements) as $key) {
     if (isset($elements[$key]) && $elements[$key]) {
@@ -578,12 +581,12 @@ function _form_validate($elements, &$for
       // and a textfield could return '0' and empty('0') returns TRUE so we
       // need a special check for the '0' string.
       if ($elements['#required'] && empty($elements['#value']) && $elements['#value'] !== '0') {
-        form_error($elements, t('!name field is required.', array('!name' => $elements['#title'])));
+        form_error($elements, $t('!name field is required.', array('!name' => $elements['#title'])));
       }
 
       // Verify that the value is not longer than #maxlength.
       if (isset($elements['#maxlength']) && drupal_strlen($elements['#value']) > $elements['#maxlength']) {
-        form_error($elements, t('!name cannot be longer than %max characters but is currently %length characters long.', array('!name' => empty($elements['#title']) ? $elements['#parents'][0] : $elements['#title'], '%max' => $elements['#maxlength'], '%length' => drupal_strlen($elements['#value']))));
+        form_error($elements, $t('!name cannot be longer than %max characters but is currently %length characters long.', array('!name' => empty($elements['#title']) ? $elements['#parents'][0] : $elements['#title'], '%max' => $elements['#maxlength'], '%length' => drupal_strlen($elements['#value']))));
       }
 
       if (isset($elements['#options']) && isset($elements['#value'])) {
@@ -597,13 +600,13 @@ function _form_validate($elements, &$for
           $value = $elements['#type'] == 'checkboxes' ? array_keys(array_filter($elements['#value'])) : $elements['#value'];
           foreach ($value as $v) {
             if (!isset($options[$v])) {
-              form_error($elements, t('An illegal choice has been detected. Please contact the site administrator.'));
+              form_error($elements, $t('An illegal choice has been detected. Please contact the site administrator.'));
               watchdog('form', 'Illegal choice %choice in !name element.', array('%choice' => $v, '!name' => empty($elements['#title']) ? $elements['#parents'][0] : $elements['#title']), WATCHDOG_ERROR);
             }
           }
         }
         elseif (!isset($options[$elements['#value']])) {
-          form_error($elements, t('An illegal choice has been detected. Please contact the site administrator.'));
+          form_error($elements, $t('An illegal choice has been detected. Please contact the site administrator.'));
           watchdog('form', 'Illegal choice %choice in %name element.', array('%choice' => $elements['#value'], '%name' => empty($elements['#title']) ? $elements['#parents'][0] : $elements['#title']), WATCHDOG_ERROR);
         }
       }
@@ -1969,20 +1972,23 @@ function theme_file($element) {
  *   A string representing the form element.
  */
 function theme_form_element($element, $value) {
+  // This is also used in the installer, pre-database setup.
+  $t = get_t();
+  
   $output  = '<div class="form-item"';
   if (!empty($element['#id'])) {
     $output .= ' id="'. $element['#id'] .'-wrapper"';
   }
   $output .= ">\n";
-  $required = !empty($element['#required']) ? '<span class="form-required" title="'. t('This field is required.') .'">*</span>' : '';
+  $required = !empty($element['#required']) ? '<span class="form-required" title="'. $t('This field is required.') .'">*</span>' : '';
 
   if (!empty($element['#title'])) {
     $title = $element['#title'];
     if (!empty($element['#id'])) {
-      $output .= ' <label for="'. $element['#id'] .'">'. t('!title: !required', array('!title' => $title, '!required' => $required)) ."</label>\n";
+      $output .= ' <label for="'. $element['#id'] .'">'. $t('!title: !required', array('!title' => $title, '!required' => $required)) ."</label>\n";
     }
     else {
-      $output .= ' <label>'. t('!title: !required', array('!title' => $title, '!required' => $required)) ."</label>\n";
+      $output .= ' <label>'. $t('!title: !required', array('!title' => $title, '!required' => $required)) ."</label>\n";
     }
   }
 
diff -urpN --strip-trailing-cr ../drupal-6.x-dev/includes/install.inc ./includes/install.inc
--- ../drupal-6.x-dev/includes/install.inc	2007-09-07 12:48:24.000000000 +0200
+++ ./includes/install.inc	2007-11-11 16:22:19.000000000 +0100
@@ -595,8 +595,9 @@ function install_goto($path) {
 }
 
 /**
- * Hardcoded function for doing the equivalent of theme('placeholder')
- * when the theme system is not available.
+ * Hardcoded function for doing the equivalent of t() during
+ * the install process, when database, theme, and localization
+ * system is possibly not yet available.
  */
 function st($string, $args = array()) {
   static $locale_strings = NULL;
diff -urpN --strip-trailing-cr ../drupal-6.x-dev/includes/locale.inc ./includes/locale.inc
--- ../drupal-6.x-dev/includes/locale.inc	2007-10-15 21:51:06.000000000 +0200
+++ ./includes/locale.inc	2007-11-11 16:22:19.000000000 +0100
@@ -917,7 +917,7 @@ function locale_add_language($langcode, 
 
   // Only set it as default if enabled.
   if ($enabled && $default) {
-    variable_set('language_default', (object) array('language' => $langcode, 'name' => $name, 'native' => $native, 'direction' => $direction, 'enabled' => (int) $enabled, 'plurals' => 0, 'formula' => '', 'domain' => '', 'prefix' => $prefix, 'weight' => 0));
+    variable_set('language_default', (object) array('language' => $langcode, 'name' => $name, 'native' => $native, 'direction' => $direction, 'enabled' => (int) $enabled, 'plurals' => 0, 'formula' => '', 'domain' => '', 'prefix' => $prefix, 'weight' => 0, 'javascript' => ''));
   }
 
   if ($enabled) {
@@ -2542,7 +2542,7 @@ function _locale_batch_language_finished
  * Advance installer task to the finished screen.
  */
 function _locale_batch_installer_finished($success, $results) {
-  variable_set('install_task', 'finished');
+  variable_set('install_task', 'configure');
 }
 
 /**
diff -urpN --strip-trailing-cr ../drupal-6.x-dev/install.php ./install.php
--- ../drupal-6.x-dev/install.php	2007-11-11 07:56:44.000000000 +0100
+++ ./install.php	2007-11-11 16:02:33.000000000 +0100
@@ -27,6 +27,9 @@ function install_main() {
   // Ensure correct page headers are sent (e.g. caching)
   drupal_page_header();
 
+  // Set up $language, so t() caller functions will still work.
+  drupal_init_language();
+
   // Check existing settings.php.
   $verify = install_verify_settings();
 
@@ -544,6 +547,19 @@ function install_select_locale($profilen
     return FALSE;
   }
   else {
+    // Allow profile to pre-select the language.
+    $function = $profilename .'_profile_details';
+    if (function_exists($function)) {
+      $details = $function();
+      if (isset($details['language'])) {
+        foreach ($locales as $locale) {
+          if ($details['language'] == $locale->name) {
+            return $locale->name;
+          }
+        }
+      }
+    }
+
     foreach ($locales as $locale) {
       if ($_POST['locale'] == $locale->name) {
         return $locale->name;
@@ -631,16 +647,47 @@ function install_tasks($profile, $task) 
   drupal_bootstrap(DRUPAL_BOOTSTRAP_FULL);
   $_SESSION['messages'] = $messages;
 
-  // Build a page for a final task.
+  // Build a page for final tasks.
   drupal_maintenance_theme();
   if (empty($task)) {
-    variable_set('install_task', 'configure');
-    $task = 'configure';
+    variable_set('install_task', 'locale-import');
+    $task = 'locale-import';
   }
 
   // We are using a list of if constructs here to allow for
   // passing from one task to the other in the same request.
 
+  // Import interface translations for the enabled modules.
+  if ($task == 'locale-import') {
+    if (!empty($install_locale) && ($install_locale != 'en')) {
+      include_once 'includes/locale.inc';
+      // Enable installation language as default site language.
+      locale_add_language($install_locale, NULL, NULL, NULL, NULL, NULL, 1, TRUE);
+      // Collect files to import for this language.
+      $batch = locale_batch_by_language($install_locale);
+      if (!empty($batch)) {
+        // Start a batch, switch to 'locale-batch' task. We need to
+        // set the variable here, because batch_process() redirects.
+        variable_set('install_task', 'locale-batch');
+        batch_set($batch);
+        $path = $base_url .'/install.php?locale='. $install_locale .'&profile='. $profile;
+        batch_process($path, $path);
+      }
+    }
+    // Found nothing to import or not foreign language, go to next task.
+    $task = 'configure';
+  }
+
+  // We are running a batch import of interface translation files.
+  // This might run in multiple HTTP requests, constantly redirecting
+  // to the same address, until the batch finished callback is invoked
+  // and the task advances to 'configure'.
+  if ($task == 'locale-batch') {
+    include_once 'includes/batch.inc';
+    include_once 'includes/locale.inc';
+    $output = _batch_page();
+  }
+
   if ($task == 'configure') {
     drupal_set_title(st('Configure site'));
 
@@ -679,51 +726,26 @@ function install_tasks($profile, $task) 
   if (!in_array($task, install_reserved_tasks())) {
     $function = $profile .'_profile_tasks';
     if (function_exists($function)) {
+      // Remove the page title of 'Configure site' task.
+      drupal_set_title('');
       // The profile needs to run more code, maybe even more tasks.
       // $task is sent through as a reference and may be changed!
-      $output = $function($task);
+      $output = $function($task, $base_url .'/install.php?locale='. $install_locale .'&profile='. $profile);
     }
 
     // If the profile doesn't move on to a new task we assume
-    // that it is done: we let the installer regain control and
-    // proceed with the locale import.
+    // that it is done.
     if ($task == 'profile') {
-      $task = 'locale-import';
+      $task = 'profile-finished';
     }
   }
 
-  // Import interface translations for the enabled modules, after
-  // any changes made by the profile through the profile forms.
-  if ($task == 'locale-import') {
-    if (!empty($install_locale) && ($install_locale != 'en')) {
-      include_once 'includes/locale.inc';
-      // Enable installation language as default site language.
-      locale_add_language($install_locale, NULL, NULL, NULL, NULL, NULL, 1, TRUE);
-      // Collect files to import for this language.
-      $batch = locale_batch_by_language($install_locale);
-      if (!empty($batch)) {
-        // Start a batch, switch to 'locale-batch' task. We need to
-        // set the variable here, because batch_process() redirects.
-        variable_set('install_task', 'locale-batch');
-        batch_set($batch);
-        $path = $base_url .'/install.php?locale='. $install_locale .'&profile='. $profile;
-        batch_process($path, $path);
-      }
-    }
-    // Found nothing to import or not foreign language, go to next task.
+  // Profile custom tasks are done, so let the installer regain
+  // control and proceed with the final page.
+  if ($task == 'profile-finished') {
     $task = 'finished';
   }
 
-  // We are running a batch import of interface translation files.
-  // This might run in multiple HTTP requests, constantly redirecting
-  // to the same address, until the batch finished callback is invoked
-  // and the task advances to 'finished'.
-  if ($task == 'locale-batch') {
-    include_once 'includes/batch.inc';
-    include_once 'includes/locale.inc';
-    $output = _batch_page();
-  }
-
   // Display a 'finished' page to user.
   if ($task == 'finished') {
     drupal_set_title(st('@drupal installation complete', array('@drupal' => drupal_install_profile_name())));
@@ -760,7 +782,7 @@ function install_tasks($profile, $task) 
  * The list of reserved tasks to run in the installer.
  */
 function install_reserved_tasks() {
-  return array('configure', 'locale-import', 'locale-batch', 'finished', 'done');
+  return array('configure', 'locale-import', 'locale-batch', 'profile-finished', 'finished', 'done');
 }
 
 /**
@@ -777,11 +799,15 @@ function install_check_requirements($pro
 
     foreach ($requirements as $requirement) {
       if (isset($requirement['severity']) && $requirement['severity'] == REQUIREMENT_ERROR) {
-        drupal_set_message($requirement['description'] .' ('. st('Currently using !item !version', array('!item' => $requirement['title'], '!version' => $requirement['value'])) .')', 'error');
+        $message = $requirement['description'];
+        if ($requirement['value']) {
+          $message .= ' ('. st('Currently using !item !version', array('!item' => $requirement['title'], '!version' => $requirement['value'])) .')';
+        }
+        drupal_set_message($message, 'error');
       }
     }
 
-    drupal_set_title(st('Incompatible environment'));
+    drupal_set_title(st('Requirements problem'));
     print theme('install_page', '');
     exit;
   }
@@ -797,6 +823,7 @@ function install_task_list($active = NUL
     'locale-select'  => st('Choose language'),
     'requirements'   => st('Verify requirements'),
     'database'       => st('Setup database'),
+    'locale-batch'   => st('Import translations'),
     'configure'      => st('Configure site'),
   );
 
@@ -820,11 +847,9 @@ function install_task_list($active = NUL
     }
   }
 
-  // If necessary, add translation import to the task list.
-  if (count($locales) > 1 && !empty($_GET['locale']) && $_GET['locale'] != 'en') {
-    $tasks += array(
-      'locale-batch' => st('Import translations'),
-    );
+  // If not required, remove translation import from the task list.
+  if (count($locales) < 2 || empty($_GET['locale']) || $_GET['locale'] == 'en') {
+    unset($tasks['locale-batch']);
   }
 
   // Add finished step as the last task.
diff -urpN --strip-trailing-cr ../drupal-6.x-dev/modules/system/system.install ./modules/system/system.install
--- ../drupal-6.x-dev/modules/system/system.install	2007-11-11 09:48:22.000000000 +0100
+++ ./modules/system/system.install	2007-11-11 16:01:00.000000000 +0100
@@ -111,37 +111,43 @@ function system_requirements($phase) {
   }
 
   // Test files directory
-  if ($phase == 'runtime') {
-    $directory = file_directory_path();
-    $is_writable = is_writable($directory);
-    $is_directory = is_dir($directory);
-    if (!$is_writable || !$is_directory) {
-      if (!$is_directory) {
-        $error = $t('The directory %directory does not exist.', array('%directory' => $directory));
-      }
-      else {
-        $error = $t('The directory %directory is not writable.', array('%directory' => $directory));
-      }
+  $directory = file_directory_path();
+  $is_writable = is_writable($directory);
+  $is_directory = is_dir($directory);
+  if (!$is_writable || !$is_directory) {
+    if (!$is_directory) {
+      $error = $t('The directory %directory does not exist.', array('%directory' => $directory));
+    }
+    else {
+      $error = $t('The directory %directory is not writable.', array('%directory' => $directory));
+    }
+    $requirements['file system'] = array(
+      'value' => $t('Not writable'),
+      'severity' => REQUIREMENT_ERROR,
+    );
+    if ($phase == 'runtime') {
+      $requirements['file system']['description'] = $error .' '. $t('You may need to set the correct directory at the <a href="@admin-file-system">file system settings page</a> or change the current directory\'s permissions so that it is writable.', array('@admin-file-system' => url('admin/settings/file-system')));
+    }
+    else if ($phase == 'install') {
+      // For the installer UI, we need a different wording. 'value' will
+      // be treated as version, so provide none here.
+      $requirements['file system']['description'] = $error .' '. $t("You need to provide a writable %directory directory by changing it's permissions or creating a new one, before you can proceed with the installation.", array('%directory' => $directory));
+      $requirements['file system']['value'] = '';
+    }
+  }
+  else {
+    if (variable_get('file_downloads', FILE_DOWNLOADS_PUBLIC) == FILE_DOWNLOADS_PUBLIC) {
       $requirements['file system'] = array(
-        'value' => $t('Not writable'),
-        'severity' => REQUIREMENT_ERROR,
-        'description' => $error .' '. $t('You may need to set the correct directory at the <a href="@admin-file-system">file system settings page</a> or change the current directory\'s permissions so that it is writable.', array('@admin-file-system' => url('admin/settings/file-system'))),
+        'value' => $t('Writable (<em>public</em> download method)'),
       );
     }
     else {
-      if (variable_get('file_downloads', FILE_DOWNLOADS_PUBLIC) == FILE_DOWNLOADS_PUBLIC) {
-        $requirements['file system'] = array(
-          'value' => $t('Writable (<em>public</em> download method)'),
-        );
-      }
-      else {
-        $requirements['file system'] = array(
-          'value' => $t('Writable (<em>private</em> download method)'),
-        );
-      }
+      $requirements['file system'] = array(
+        'value' => $t('Writable (<em>private</em> download method)'),
+      );
     }
-    $requirements['file system']['title'] = $t('File system');
   }
+  $requirements['file system']['title'] = $t('File system');
 
   // See if updates are available in update.php.
   if ($phase == 'runtime') {
diff -urpN --strip-trailing-cr ../drupal-6.x-dev/profiles/default/default.profile ./profiles/default/default.profile
--- ../drupal-6.x-dev/profiles/default/default.profile	2007-11-06 10:00:31.000000000 +0100
+++ ./profiles/default/default.profile	2007-11-11 16:22:19.000000000 +0100
@@ -15,12 +15,15 @@ function default_profile_modules() {
  * Return a description of the profile for the initial installation screen.
  *
  * @return
- *   An array with keys 'name' and 'description' describing this profile.
+ *   An array with keys 'name' and 'description' describing this profile,
+ *   and optional 'language' to override the install-language selection
+ *   for language-specific profiles.
  */
 function default_profile_details() {
   return array(
     'name' => 'Drupal',
-    'description' => 'Select this profile to enable some basic Drupal functionality and the default theme.'
+    'description' => 'Select this profile to enable some basic Drupal functionality and the default theme.',
+//  'language' => 'en',
   );
 }
 
@@ -39,20 +42,24 @@ function default_profile_task_list() {
 /**
  * Perform any final installation tasks for this profile.
  *
- * The installer goes through the configure -> locale-import ->
- * locale-batch -> finished -> done tasks in this order, if you
+ * The installer goes through the locale-import -> locale-batch
+ * -> configure -> finished -> done tasks in this order, if you
  * don't implement this function in your profile.
  *
  * If this function is implemented, you can have any number of
- * custom tasks to perform, implementing a state machine here to
- * walk the user through those tasks, by setting $task to something
- * other then the reserved tasks listed in install_reserved_tasks()
- * and the 'profile' task this function gets called with for first
- * time. If you implement your custom tasks, this function will get called
- * in every HTTP request (for form processing, printing your
- * information screens and so on) until you advance to the
- * 'locale-import' task, with which you hand control back to the
- * installer.
+ * custom tasks to perform after 'configure', implementing a state
+ * machine here to walk the user through those tasks. First time,
+ * this function get called with $task set to 'profile', and you
+ * can advance to further tasks by setting $task to your tasks'
+ * identifiers, used as array keys in the hook_profile_task_list()
+ * above. You must avoid the reserved tasks listed in
+ * install_reserved_tasks(). If you implement your custom tasks,
+ * this function will get called in every HTTP request (for form
+ * processing, printing your information screens and so on) until
+ * you advance to the 'profile-finished' task, with which you
+ * hand control back to the installer. Each custom page you
+ * return needs to provide a way to continue, such as form-submit
+ * or a link.
  *
  * You should define the list of custom tasks you implement by
  * returning an array of them in hook_profile_task_list().
@@ -65,12 +72,15 @@ function default_profile_task_list() {
  * @param $task
  *   The current $task of the install system. When hook_profile_tasks()
  *   is first called, this is 'profile'.
+ * @param $url
+ *   Complete URL to be used for a link or form action on a custom page,
+ *   if providing any, to allow the user to proceed with the installation.
  *
  * @return
  *   An optional HTML string to display to the user. Only used if you
  *   modify the $task, otherwise discarded.
  */
-function default_profile_tasks(&$task) {
+function default_profile_tasks(&$task, $url) {
 
   // Insert default user-defined node types into the database. For a complete
   // list of available node type attributes, refer to the node type API
