How to migrate multilingual content from CSV to Drupal 8? I come from read Using the new Drupal 8 Migration API / Module and Content Migration: CSV to Drupal 8 the process to create a migration is very clear and its works, but I can't find how to migrate content to a Multilingual site. In the Migrate API overview I can't find any information about this.

So, how can I migrate multilingual content? 

UPDATE:
I found an example: https://github.com/drupal/drupal/tree/8.3.x/core/modules/migrate/tests/modules/migrate_external_translated_test 

I was able for the moment to migrate the english content but not the translations.
you need both migration-tasks, the yml files in the migration folder:

migrate.migration.external_translated_test_node.yml
migrate.migration.external_translated_test_node_translation.yml


Then in the Plugin (MigrateExternalTranslatedTestSource.php), you need to read your .csv (in initializeIterator()) into the structure of the import array:

  /**
   * The data to import.
   *
   * @var array
   */
   protected $import = [
    ['name' =&gt; 'cat', 'title' =&gt; 'Cat', 'lang' =&gt; 'English'],
    ['name' =&gt; 'cat', 'title' =&gt; 'Chat', 'lang' =&gt; 'French'],
    ['name' =&gt; 'cat', 'title' =&gt; 'Gato', 'lang' =&gt; 'Spanish'],
    ['name' =&gt; 'dog', 'title' =&gt; 'Dog', 'lang' =&gt; 'English'],
    ['name' =&gt; 'dog', 'title' =&gt; 'Chien', 'lang' =&gt; 'French'],
    ['name' =&gt; 'monkey', 'title' =&gt; 'Monkey', 'lang' =&gt; 'English'],
   ];