ISTWCMS-5866: improve error message text and show originally entered path

uw_cfg_common.module

@@ -958,6 +958,7 @@ function _uw_cfg_common_alias_validate(array &$form, FormStateInterface $form_st
 
   // Get the alias from the form state values.
   $alias = $values['path'][0]['alias'];
+  $orig_alias = $alias;
 
   // Trim any surrounding slashes from the alias to
   // ensure that we are getting exact matches for the
@@ -981,7 +982,7 @@ function _uw_cfg_common_alias_validate(array &$form, FormStateInterface $form_st
   ) {
 
     // Set an error message if alias exists.
-    $form_state->setError($form['path']['widget'][0]['alias'], t('@url cannot be an alias.', ['@url' => $alias]));
+    $form_state->setError($form['path']['widget'][0]['alias'], t('The alias "@url" is a reserved path that cannot be used.', ['@url' => $orig_alias]));
   }
 }