Alphabetically ordering vocabulary terms in a translated
I found an old solution for Drupal 7 and just changed it until it worked. ;)
function MYMODULE_form_views_exposed_form_alter(&amp;$form, $form_state) {
  if (array_key_exists('MYEXPOSEDFILTERKEY', $form)) {
    asort($form['MYEXPOSEDFILTERKEY']['#options']);
  }
}

It's fairly simply and works as at that point the options are already translated. So, you just need to sort the options in the respective filter.