You can customize the emails approvers see when they get a notification to approve/review a form. You need to be a Form Owner or Form Admin to customize the approver email template.  

Note: This setting affects all users and recipients of this form.  

How to customize the approver email 

1. Log into your account.
2. Navigate to your form's responses page for the form you are customizing. 
3. Click on Settings.
4. Next to Approver Email, click Edit.
5. You can update the Email Subject, Email Body, and Allow Replies for the Approver Email. To learn more about what each of these means, see here.Note: {recipient} in the email subject and body corresponds to the Email Information, which can display specific information for each submission. For more details on how to customize {recipient}, see this guide.
6. Click Update email template to save any changes you've made to the template.

Things you can customize

• Updates to the Email Subject changes the title of the email. This is the preview people see before they click into the email.
• Updates to the Email Body changes the content of the email. This is the content people see when they click to see the email.
• Changing Allow replies allows you to specify if replies to the email should be sent the original sender. 
  • When Allows replies are checked, the approver can reply directly to the form owner (for group forms) or previous approver (for routed forms) 
  • When Allow replies is not checked, approvers can not reply directly to the form owner or previous approver.