Changed "Actor" to "Person" in a few places

src/EntityTypeRelationsWidget.php

@@ -20,7 +20,7 @@ class EntityTypeRelationsWidget {
       $options[$machine_name] = $info['label'];
     }
     $form['allowed_actor_types'] = array(
-      '#title' => t('Actor types'),
+      '#title' => t('Allowed involved parties'),
       '#description' => t('Types of people that can be involved in this kind of case.'),
       '#type' => 'checkboxes',
       '#options' => $options

src/Plugin/Block/ActorTypeHelp.php

@@ -21,7 +21,7 @@ class ActorTypeHelp extends BlockBase {
   public function build() {
     return array(
       '#markup' => "
-        <h3>All actor types have contact details fields by default. Other fields can be added and managed here.</h3>
+        <h3>All person types have contact details fields by default. Other fields can be added and managed here.</h3>
 
       "
     );