This is the email the project contact will receive as a reminder when his project is about to expire. The following context variables are provided when the email is rendered:
project - the project about to expire
remaining_days - the remaining days before the project expires
{% include 'customizations/customizations_upload.html' with element=billing_project_expiration_reminder_email_subject name='billing project expiration reminder email subject' button_name='Upload project expiration reminder subject' extension='txt' key='billing' %}
{% include 'customizations/customizations_upload.html' with element=billing_project_expiration_reminder_email_message name='billing project expiration reminder email message' button_name='Upload project expiration reminder email' key='billing' %}