Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/modules/language/src/Exception/DeleteDefaultLanguageException.php

@@ -0,0 +1,13 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\language\Exception\DeleteDefaultLanguageException.
+ */
+
+namespace Drupal\language\Exception;
+
+/**
+ * Exception thrown when deleting the default language.
+ */
+class DeleteDefaultLanguageException extends LanguageException {}