Issue #1804926 by rbayliss, ela.m, typhonius, edrupal: Convert register_pending_approval_admin() email to config system and provide the ability to configure it in UI.

core/modules/user/config/user.mail.yml

@@ -13,6 +13,9 @@ register_no_approval_required:
 register_pending_approval:
   body: "[user:name],\n\nThank you for registering at [site:name]. Your application for an account is currently pending approval. Once it has been approved, you will receive another e-mail containing information about how to log in, set your password, and other details.\n\n\n--  [site:name] team"
   subject: 'Account details for [user:name] at [site:name] (pending admin approval)'
+register_pending_approval_admin:
+  body: "[user:name] has applied for an account.\n\n[user:edit-url]"
+  subject: 'Account details for [user:name] at [site:name] (pending admin approval)'
 status_activated:
   body: "[user:name],\n\nYour account at [site:name] has been activated.\n\nYou may now log in by clicking this link or copying and pasting it into your browser:\n\n[user:one-time-login-url]\n\nThis link can only be used once to log in and will lead you to a page where you can set your password.\n\nAfter setting your password, you will be able to log in at [site:login-url] in the future using:\n\nusername: [user:name]\npassword: Your password\n\n--  [site:name] team"
   subject: 'Account details for [user:name] at [site:name] (approved)'

core/modules/user/user.admin.inc

@@ -439,6 +439,27 @@ function user_admin_settings($form, &$form_state) {
     '#rows' => 8,
   );
 
+  $form['email_pending_approval_admin'] = array(
+    '#type' => 'details',
+    '#title' => t('Admin (user awaiting approval)'),
+    '#collapsible' => TRUE,
+    '#collapsed' => ($config->get('register') != USER_REGISTER_VISITORS_ADMINISTRATIVE_APPROVAL),
+    '#description' => t('Edit the e-mail notifying the site administrator that there are new members awaiting administrative approval.') . ' ' . $email_token_help,
+    '#group' => 'email',
+  );
+  $form['email_pending_approval_admin']['register_pending_approval_admin_subject'] = array(
+    '#type' => 'textfield',
+    '#title' => t('Subject'),
+    '#default_value' => $mail_config->get('register_pending_approval_admin.subject'),
+    '#maxlength' => 180,
+  );
+  $form['email_pending_approval_admin']['register_pending_approval_admin_body'] = array(
+    '#type' => 'textarea',
+    '#title' => t('Body'),
+    '#default_value' => $mail_config->get('register_pending_approval_admin.body'),
+    '#rows' => 8,
+  );
+
   $form['email_no_approval_required'] = array(
     '#type' => 'details',
     '#title' => t('Welcome (no approval required)'),

core/modules/user/user.install

@@ -585,6 +585,8 @@ function user_update_8006() {
     'register_admin_created_body' => 'register_admin_created.body',
     'register_pending_approval_subject' => 'register_pending_approval.subject',
     'register_pending_approval_body' => 'register_pending_approval.body',
+    'register_pending_approval_admin_body' => 'register_pending_approval_admin.body',
+    'register_pending_approval_admin_subject' => 'register_pending_approval_admin.subject',
     'register_no_approval_required_subject' => 'register_no_approval_required.subject',
     'register_no_approval_required_body' => 'register_no_approval_required.body',
     'password_reset_subject' => 'password_reset.subject',