first import

sites/all/modules/variable/includes/locale.variable.inc

@@ -0,0 +1,92 @@
+<?php
+/**
+ * @file
+ * Variable API module. Definition for Drupal core variables
+ */
+
+/**
+ * Implements hook_variable_info().
+ */
+function locale_variable_info($options) {
+  // This variable will be altered by translation module. See translation.variable.inc
+  $variables['language_content_type_[node_type]'] = array(
+    'type' => 'multiple',
+    'title' => t('Multilingual support'),
+    'repeat' => array(
+      'type' => 'enable',
+       // Set options here so translation module can add some more
+      'options' => array(t('Disabled'), t('Enabled')),
+    ),
+    'description' => t('Enable multilingual support for this content type. If enabled, a language selection field will be added to the editing form, allowing you to select from one of the <a href="!languages">enabled languages</a>. If disabled, new posts are saved with the default language. Existing content will not be affected by changing this option.', array('!languages' => url('admin/config/regional/language', $options)), $options),
+    'group' => 'node_type_settings',
+  );
+  $variables['language_default'] = array(
+    'title' => t('Site default language'),
+    'type' => 'select',
+    'group' => 'regional_settings',
+    'options callback' => 'locale_variable_options_language',
+    'format callback' => 'locale_variable_language_default_format',
+    'element callback' => 'locale_variable_language_default_element',
+    'default callback' => 'locale_variable_language_default',
+  );
+  return $variables;
+}
+
+/**
+ * Implements hook_variable_type_info().
+ */
+function locale_variable_type_info() {
+  // Language code
+  $type['language'] = array(
+    'title' => t('Language'),
+    'options callback' => 'locale_variable_options_language',
+    'type' => 'select',
+  );
+  return $type;
+}
+
+/**
+ * Callback for all languages
+ */
+function locale_variable_options_language($variable, $options) {
+  return locale_language_list('name', TRUE);
+}
+
+/**
+ * Form element for site default language
+ */
+function locale_variable_language_default_element($variable, $options) {
+  $element = variable_form_element_options($variable, $options);
+  // Default needs to be language code for the radios to work.
+  $element['#default_value'] = $element['#default_value']->language;
+  // Since 'value callback' is useless as it is run before validation, we use validate
+  // callback to transform language code into an object.
+  $element['#element_validate'][] = 'locale_variable_language_element_validate';
+  return $element;
+}
+
+/**
+ * Get language default.
+ */
+function locale_variable_language_default($variable, $options) {
+  return language_default();
+}
+
+/**
+ * Format language object variable
+ */
+function locale_variable_language_default_format($variable, $options = array()) {
+  return !empty($variable['value']) ? check_plain($variable['value']->name) : t('None');
+}
+
+
+/**
+ * Replace language code by language object on submission.
+ *
+ * This runs alter default element validation so we know it is a valid checkbox option.
+ */
+function locale_variable_language_element_validate($element, &$form_state, $form) {
+  $languages = language_list();
+  $language = $languages[$element['#value']];
+  form_set_value($element, $language, $form_state);
+}