Banktransfer: use proper formatting for IBANs

src/pretix/plugins/banktransfer/templates/pretixplugins/banktransfer/checkout_payment_form.html

@@ -1,4 +1,5 @@
 {% load i18n %}
+{% load ibanformat %}
 
 <p>{% blocktrans trimmed %}
     After completing your purchase, we will ask you to transfer the money to the following
@@ -8,7 +9,7 @@
 <address>
     {% if settings.bank_details_type == "sepa" %}
         {% trans "Account holder" %}: {{ settings.bank_details_sepa_name }}<br>
-        {% trans "IBAN" %}: {{ settings.bank_details_sepa_iban }}<br>
+        {% trans "IBAN" %}: {{ settings.bank_details_sepa_iban|ibanformat }}<br>
         {% trans "BIC" %}: {{ settings.bank_details_sepa_bic }}<br>
         {% trans "Bank" %}: {{ settings.bank_details_sepa_bank }}<br>
     {% endif %}

src/pretix/plugins/banktransfer/templates/pretixplugins/banktransfer/pending.html

@@ -1,6 +1,7 @@
 {% load i18n %}
 {% load l10n %}
 {% load commadecimal %}
+{% load ibanformat %}
 {% load money %}
 
 <p>{% blocktrans trimmed %}
@@ -12,7 +13,7 @@
         <p>
             {% if settings.bank_details_type == "sepa" %}
                 <strong>{% trans "Account holder" %}:</strong> {{ settings.bank_details_sepa_name }}<br>
-                <strong>{% trans "IBAN" %}:</strong> {{ settings.bank_details_sepa_iban }}<br>
+                <strong>{% trans "IBAN" %}:</strong> {{ settings.bank_details_sepa_iban|ibanformat }}<br>
                 <strong>{% trans "BIC" %}:</strong> {{ settings.bank_details_sepa_bic }}<br>
                 <strong>{% trans "Bank" %}:</strong> {{ settings.bank_details_sepa_bank }}<br>
             {% endif %}

src/pretix/plugins/banktransfer/templatetags/ibanformat.py

@@ -0,0 +1,8 @@
+from django import template
+
+register = template.Library()
+
+
+@register.filter
+def ibanformat(value):
+    return ' '.join(value[i:i + 4] for i in range(0, len(value), 4))