diff --git a/core/modules/language/language.admin.inc b/core/modules/language/language.admin.inc
index 47eea47..38c8557 100644
--- a/core/modules/language/language.admin.inc
+++ b/core/modules/language/language.admin.inc
@@ -5,213 +5,7 @@
  * Administration functions for language.module.
  */
 
-use Drupal\Core\Language\Language;
 use Drupal\Core\Language\LanguageManager;
-use Symfony\Component\HttpFoundation\RedirectResponse;
-use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
-
-/**
- * User interface for the language addition screen.
- */
-function language_admin_add_form($form, &$form_state) {
-  $predefined_languages = language_admin_predefined_list();
-  $predefined_languages['custom'] = t('Custom language...');
-  $predefined_default = !empty($form_state['values']['predefined_langcode']) ? $form_state['values']['predefined_langcode'] : key($predefined_languages);
-  $form['predefined_langcode'] = array(
-    '#type' => 'select',
-    '#title' => t('Language name'),
-    '#default_value' => $predefined_default,
-    '#options' => $predefined_languages,
-  );
-  $form['predefined_submit'] = array(
-    '#type' => 'submit',
-    '#value' => t('Add language'),
-    '#limit_validation_errors' => array(array('predefined_langcode'), array('predefined_submit')),
-    '#states' => array(
-      'invisible' => array(
-        'select#edit-predefined-langcode' => array('value' => 'custom'),
-      ),
-    ),
-    '#validate' => array('language_admin_add_predefined_form_validate'),
-    '#submit' => array('language_admin_add_form_submit'),
-  );
-
-  $form['custom_language'] = array(
-    '#type' => 'container',
-    '#states' => array(
-      'visible' => array(
-        'select#edit-predefined-langcode' => array('value' => 'custom'),
-      ),
-    ),
-  );
-  _language_admin_common_controls($form['custom_language']);
-  $form['custom_language']['submit'] = array(
-    '#type' => 'submit',
-    '#value' => t('Add custom language'),
-    '#validate' => array('language_admin_add_custom_form_validate'),
-    '#submit' => array('language_admin_add_form_submit'),
-  );
-
-  return $form;
-}
-
-/**
- * Editing screen for a particular language.
- *
- * @param $langcode
- *   Language code of the language to edit.
- */
-function language_admin_edit_form($form, &$form_state, $language) {
-  _language_admin_common_controls($form, $language);
-  $form['actions'] = array('#type' => 'actions');
-  $form['actions']['submit'] = array(
-    '#type' => 'submit',
-    '#value' => t('Save language')
-  );
-  $form['#submit'][] = 'language_admin_edit_form_submit';
-  $form['#validate'][] = 'language_admin_edit_form_validate';
-  return $form;
-}
-
-/**
- * Common elements of the language addition and editing form.
- *
- * @param $form
- *   A parent form item (or empty array) to add items below.
- * @param $language
- *   Language object to edit.
- */
-function _language_admin_common_controls(&$form, $language = NULL) {
-  if (!is_object($language)) {
-    $language = new Language(array('id' => NULL, 'name' => NULL,));
-  }
-  if (isset($language->id)) {
-    $form['langcode_view'] = array(
-      '#type' => 'item',
-      '#title' => t('Language code'),
-      '#markup' => $language->id
-    );
-    $form['langcode'] = array(
-      '#type' => 'value',
-      '#value' => $language->id
-    );
-  }
-  else {
-    $form['langcode'] = array(
-      '#type' => 'textfield',
-      '#title' => t('Language code'),
-      '#maxlength' => 12,
-      '#required' => TRUE,
-      '#default_value' => '',
-      '#disabled' => FALSE,
-      '#description' => t('Use language codes as <a href="@w3ctags">defined by the W3C</a> for interoperability. <em>Examples: "en", "en-gb" and "zh-hant".</em>', array('@w3ctags' => 'http://www.w3.org/International/articles/language-tags/')),
-    );
-  }
-  $form['name'] = array(
-    '#type' => 'textfield',
-    '#title' => t('Language name in English'),
-    '#maxlength' => 64,
-    '#default_value' => @$language->name,
-    '#required' => TRUE,
-  );
-  $form['direction'] = array(
-    '#type' => 'radios',
-    '#title' => t('Direction'),
-    '#required' => TRUE,
-    '#description' => t('Direction that text in this language is presented.'),
-    '#default_value' => @$language->direction,
-    '#options' => array(Language::DIRECTION_LTR => t('Left to right'), Language::DIRECTION_RTL => t('Right to left')),
-  );
-  return $form;
-}
-
-/**
- * Element specific validator for the Add language button.
- */
-function language_admin_add_predefined_form_validate($form, &$form_state) {
-  $langcode = $form_state['values']['predefined_langcode'];
-  if ($langcode == 'custom') {
-    form_set_error('predefined_langcode', t('Fill in the language details and save the language with <em>Add custom language</em>.'));
-  }
-  else {
-    if ($language = language_load($langcode)) {
-      form_set_error('predefined_langcode', t('The language %language (%langcode) already exists.', array('%language' => $language->name, '%langcode' => $langcode)));
-    }
-  }
-}
-
-/**
- * Validate the language addition form on custom language button.
- */
-function language_admin_add_custom_form_validate($form, &$form_state) {
-  if ($form_state['values']['predefined_langcode'] == 'custom') {
-    $langcode = $form_state['values']['langcode'];
-    // Reuse the editing form validation routine if we add a custom language.
-    language_admin_edit_form_validate($form['custom_language'], $form_state);
-
-    if ($language = language_load($langcode)) {
-      form_set_error('langcode', t('The language %language (%langcode) already exists.', array('%language' => $language->name, '%langcode' => $langcode)));
-    }
-  }
-  else {
-    form_set_error('predefined_langcode', t('Use the <em>Add language</em> button to save a predefined language.'));
-  }
-}
-
-/**
- * Process the custom and predefined language addition form submission.
- */
-function language_admin_add_form_submit($form, &$form_state) {
-  $langcode = $form_state['values']['predefined_langcode'];
-  if ($langcode == 'custom') {
-    $langcode = $form_state['values']['langcode'];
-    // Custom language form.
-    $language = new Language(array(
-      'id' => $langcode,
-      'name' => $form_state['values']['name'],
-      'direction' => $form_state['values']['direction'],
-    ));
-  }
-  else {
-    $language = new Language(array('id' => $langcode));
-  }
-  // Save the language and inform the user that it happened.
-  $language = language_save($language);
-  drupal_set_message(t('The language %language has been created and can now be used.', array('%language' => $language->name)));
-
-  // Tell the user they have the option to add a language switcher block
-  // to their theme so they can switch between the languages.
-  drupal_set_message(t('Use one of the language switcher blocks to allow site visitors to switch between languages. You can enable these blocks on the <a href="@block-admin">block administration page</a>.', array('@block-admin' => url('admin/structure/block'))));
-
-  $form_state['redirect'] = 'admin/config/regional/language';
-}
-
-/**
- * Validate the language editing form. Reused for custom language addition too.
- */
-function language_admin_edit_form_validate($form, &$form_state) {
-  // Ensure sane field values for langcode and name.
-  if (!isset($form['langcode_view']) && preg_match('@[^a-zA-Z_-]@', $form_state['values']['langcode'])) {
-    form_set_error('langcode', t('%field may only contain characters a-z, underscores, or hyphens.', array('%field' => $form['langcode']['#title'])));
-  }
-  if ($form_state['values']['name'] != check_plain($form_state['values']['name'])) {
-    form_set_error('name', t('%field cannot contain any markup.', array('%field' => $form['name']['#title'])));
-  }
-}
-
-/**
- * Process the language editing form submission.
- */
-function language_admin_edit_form_submit($form, &$form_state) {
-  // Prepare a language object for saving.
-  $languages = language_list();
-  $langcode = $form_state['values']['langcode'];
-  $language = $languages[$langcode];
-  $language->name = $form_state['values']['name'];
-  $language->direction = $form_state['values']['direction'];
-  language_save($language);
-  $form_state['redirect'] = 'admin/config/regional/language';
-}
 
 /**
  * Prepare a language code list for unused predefined languages.