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

core/modules/user/src/ProfileTranslationHandler.php

@@ -0,0 +1,60 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\user\ProfileTranslationHandler.
+ */
+
+namespace Drupal\user;
+
+use Drupal\Core\Entity\EntityInterface;
+use Drupal\content_translation\ContentTranslationHandler;
+use Drupal\Core\Form\FormStateInterface;
+
+/**
+ * Defines the translation handler for users.
+ */
+class ProfileTranslationHandler extends ContentTranslationHandler {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function hasPublishedStatus() {
+    // User status has nothing to do with translations visibility.
+    return FALSE;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function hasCreatedTime() {
+    // User creation date has nothing to do with translation creation date.
+    return FALSE;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function entityFormAlter(array &$form, FormStateInterface $form_state, EntityInterface $entity) {
+    parent::entityFormAlter($form, $form_state, $entity);
+    $form['actions']['submit']['#submit'][] = array($this, 'entityFormSave');
+  }
+
+  /**
+   * Form submission handler for ProfileTranslationHandler::entityFormAlter().
+   *
+   * This handles the save action.
+   *
+   * @see \Drupal\Core\Entity\EntityForm::build().
+   */
+  public function entityFormSave(array $form, FormStateInterface $form_state) {
+    if ($this->getSourceLangcode($form_state)) {
+      $entity = $form_state->getFormObject()->getEntity();
+      // We need a redirect here, otherwise we would get an access denied page
+      // since the current URL would be preserved and we would try to add a
+      // translation for a language that already has a translation.
+      $form_state->setRedirectUrl($entity->urlInfo());
+    }
+  }
+
+}