Order approval: Add attendee mail settings (Z#23114617, Z#23118978) (#3234)

Co-authored-by: Raphael Michel <michel@rami.io>

src/pretix/base/settings.py

@@ -2275,6 +2275,26 @@ You can select a payment method and perform the payment here:
 
 {url}
 
+Best regards,
+Your {event} team"""))
+    },
+    'mail_send_order_approved_attendee': {
+        'type': bool,
+        'default': 'False'
+    },
+    'mail_subject_order_approved_attendee': {
+        'type': LazyI18nString,
+        'default': LazyI18nString.from_gettext(gettext_noop("Your event registration: {code}")),
+    },
+    'mail_text_order_approved_attendee': {
+        'type': LazyI18nString,
+        'default': LazyI18nString.from_gettext(gettext_noop("""Hello,
+
+we approved a ticket ordered for you for {event}.
+
+You can view the details and status of your ticket here:
+{url}
+
 Best regards,
 Your {event} team"""))
     },
@@ -2292,6 +2312,26 @@ at our event. As you only ordered free products, no payment is required.
 You can change your order details and view the status of your order at
 {url}
 
+Best regards,
+Your {event} team"""))
+    },
+    'mail_send_order_approved_free_attendee': {
+        'type': bool,
+        'default': 'False'
+    },
+    'mail_subject_order_approved_free_attendee': {
+        'type': LazyI18nString,
+        'default': LazyI18nString.from_gettext(gettext_noop("Your event registration: {code}")),
+    },
+    'mail_text_order_approved_free_attendee': {
+        'type': LazyI18nString,
+        'default': LazyI18nString.from_gettext(gettext_noop("""Hello,
+
+we approved a ticket ordered for you for {event}.
+
+You can view the details and status of your ticket here:
+{url}
+
 Best regards,
 Your {event} team"""))
     },