src/Plugin/Thunder/OptionalModule/GoogleAnalytics.php
public function buildForm(array $form, FormStateInterface $form_state) {

    $form = parent::buildForm($form, $form_state);

    $form['google_analytics']['ga_account'] = [
      '#description' => t('This ID is unique to each site you want to track separately, and is in the form of UA-xxxxxxx-yy. To get a Web Property ID, <a href=":analytics" target="_blank">register your site with Google Analytics</a>, or if you already have registered your site, go to your Google Analytics Settings page to see the ID next to every site profile. <a href=":webpropertyid"  target="_blank">Find more information in the documentation</a>.', [
        ':analytics' => 'http://www.google.com/analytics/',
        ':webpropertyid' => Url::fromUri('https://developers.google.com/analytics/resources/concepts/gaConceptsAccounts', ['fragment' => 'webProperty'])
          ->toString(),
      ]),
      '#maxlength' => 20,
      '#placeholder' => 'UA-',
      '#size' => 15,
      '#title' => t('Web Property ID'),
      '#type' => 'textfield',
    ];

    return $form;
  }
public function buildForm(array $form, FormStateInterface $form_state) {

    $form = parent::buildForm($form, $form_state);

    $form['google_analytics']['ga_account'] = [
      '#description' => t('This ID is unique to each site you want to track separately, and is in the form of UA-xxxxxxx-yy. To get a Web Property ID, <a href=":analytics" target="_blank">register your site with Google Analytics</a>, or if you already have registered your site, go to your Google Analytics Settings page to see the ID next to every site profile. <a href=":webpropertyid"  target="_blank">Find more information in the documentation</a>.', [
        ':analytics' => 'http://www.google.com/analytics/',
        ':webpropertyid' => Url::fromUri('https://developers.google.com/analytics/resources/concepts/gaConceptsAccounts', ['fragment' => 'webProperty'])
          ->toString(),
      ]),
      '#maxlength' => 20,
      '#placeholder' => 'UA-',
      '#size' => 15,
      '#title' => t('Web Property ID'),
      '#type' => 'textfield',
    ];

    return $form;
  }
{@inheritdoc}