Revert back to extlink 1.7

composer.json

@@ -92,7 +92,7 @@
         "drupal/element_class_formatter": "^2.0@beta",
         "drupal/encrypt": "^3.0",
         "drupal/environment_indicator": "^4.0",
-        "drupal/extlink": "^2.0",
+        "drupal/extlink": "^1.3",
         "drupal/fast_404_generator": "^1.0",
         "drupal/field_encrypt": "^3.0",
         "drupal/field_formatter_class": "^1.5",

docroot/profiles/sdss/sdss_profile/config/sync/extlink.settings.yml

@@ -1,6 +1,5 @@
 _core:
   default_config_hash: gp38_GoeI-5DmdfeFE0NfHi_mbT2SqdU0zsJIQv-ehc
-langcode: en
 extlink_use_external_js_file: false
 extlink_exclude_admin_routes: false
 extlink_target: false
@@ -11,22 +10,15 @@ extlink_follow_no_override: false
 extlink_subdomains: false
 extlink_alert: false
 extlink_alert_text: 'This link will take you to an external web site. We are not responsible for their content.'
-extlink_additional_link_classes: ''
-extlink_additional_mailto_classes: ''
-extlink_additional_tel_classes: ''
 extlink_exclude: ''
 extlink_include: ''
-extlink_exclude_noreferrer: ''
 extlink_class: 'su-link su-link--external'
 extlink_label: ' (link is external)'
 extlink_img_class: false
 extlink_css_exclude: '.localist-widget, #lclst_widget_footer'
-extlink_css_include: ''
 extlink_css_explicit: '#page-content, .su-local-footer'
 extlink_mailto_class: mailto
 extlink_mailto_label: ' (link sends email)'
-extlink_tel_class: ''
-extlink_tel_label: '(link is a phone number)'
 extlink_use_font_awesome: false
 extlink_font_awesome_classes:
   links: 'fa fa-external-link'