Overwrite label of operator inside exposed view filter

This solution is for changing the label of one of the available operators in an exposed view form.

As far as I can tell, changing this isn't possible from the view edit page or any view hook.

The achieve this, I used the form_alter hook, like so:

/**
 * Implements hook_form_alter().
 *
 * change the filter data types.
 */
function MODULE_NAME_form_alter(
  &$form,
  FormStateInterface $form_state,
  $form_id
) {

  if ($form_id == '$FORM_ID' && $form['#id'] == '$ANOTHER_FORM_ID') {
    $form['$FILTER_WRAPPER']['$FILTER']['#options']['$OPERATOR'] = t('$YOUR_NEW_LABEL');
  }
}

$FORM_ID signifies the view type and is likely to be "views_exposed_form".

$ANOTHER_FORM_ID contains the form type, view id and display id at time of writing.

$FILTER_WRAPPER may or may not be necessary. Online guides didn't mention it but I did need to use it.