diff -u b/core/modules/language/lib/Drupal/language/Config/LanguageConfigFactoryOverride.php b/core/modules/language/lib/Drupal/language/Config/LanguageConfigFactoryOverride.php
--- b/core/modules/language/lib/Drupal/language/Config/LanguageConfigFactoryOverride.php
+++ b/core/modules/language/lib/Drupal/language/Config/LanguageConfigFactoryOverride.php
@@ -151,7 +151,7 @@
   /**
    * Creates a configuration collection name based on a langcode.
    *
-   * @param $langcode
+   * @param string $langcode
    *   The langcode.
    *
    * @return string
diff -u b/core/modules/language/lib/Drupal/language/Config/LanguageConfigOverride.php b/core/modules/language/lib/Drupal/language/Config/LanguageConfigOverride.php
--- b/core/modules/language/lib/Drupal/language/Config/LanguageConfigOverride.php
+++ b/core/modules/language/lib/Drupal/language/Config/LanguageConfigOverride.php
@@ -37,19 +37,12 @@
    * {@inheritdoc}
    */
   public function save() {
-    // Validate the configuration object name before saving.
-    static::validateName($this->name);
-
-    // If there is a schema for this configuration object, cast all values to
-    // conform to the schema.
-    if ($this->typedConfigManager->hasConfigSchema($this->name)) {
-      // Ensure that the schema wrapper has the latest data.
-      $this->schemaWrapper = NULL;
-      foreach ($this->data as $key => $value) {
-        $this->data[$key] = $this->castValue($key, $value);
-      }
+    // @todo Use configuration schema to validate.
+    //   https://drupal.org/node/2270399
+    // Perform basic data validation.
+    foreach ($this->data as $key => $value) {
+      $this->validateValue($key, $value);
     }
-
     $this->storage->write($this->name, $this->data);
     $this->isNew = FALSE;
     $this->originalData = $this->data;
@@ -60,7 +53,6 @@
    * {@inheritdoc}
    */
   public function delete() {
-    // @todo Consider to remove the pruning of data for Config::delete().
     $this->data = array();
     $this->storage->delete($this->name);
     $this->isNew = TRUE;
diff -u b/core/modules/language/lib/Drupal/language/ConfigurableLanguageManagerInterface.php b/core/modules/language/lib/Drupal/language/ConfigurableLanguageManagerInterface.php
--- b/core/modules/language/lib/Drupal/language/ConfigurableLanguageManagerInterface.php
+++ b/core/modules/language/lib/Drupal/language/ConfigurableLanguageManagerInterface.php
@@ -97,7 +97,7 @@
   public function getLanguageConfigOverride($langcode, $name);
 
   /**
-   * Gets a language config override storage object.
+   * Gets a language configuration override storage object.
    *
    * @param string $langcode
    *   The language code for the override.
only in patch2:
unchanged:
--- a/core/lib/Drupal/Core/Config/Config.php
+++ b/core/lib/Drupal/Core/Config/Config.php
@@ -237,7 +237,6 @@ public function save() {
    *   The configuration object.
    */
   public function delete() {
-    // @todo Consider to remove the pruning of data for Config::delete().
     $this->data = array();
     $this->storage->delete($this->name);
     $this->isNew = TRUE;