Allow to configure help text of email field

src/pretix/base/settings.py

@@ -672,6 +672,13 @@ Your {event} team"""))
         'default': '',
         'type': LazyI18nString
     },
+    'checkout_email_helptext': {
+        'default': LazyI18nString.from_gettext(ugettext_noop(
+            'Make sure to enter a valid email address. We will send you an order '
+            'confirmation including a link that you need to access your order later.'
+        )),
+        'type': LazyI18nString
+    },
     'organizer_info_text': {
         'default': '',
         'type': LazyI18nString

src/pretix/control/forms/event.py

@@ -502,6 +502,12 @@ class EventSettingsForm(SettingsForm):
         required=False,
         widget=I18nTextarea
     )
+    checkout_email_helptext = I18nFormField(
+        label=_("Help text of the email field"),
+        required=False,
+        widget_kwargs={'attrs': {'rows': '2'}},
+        widget=I18nTextarea
+    )
     presale_has_ended_text = I18nFormField(
         label=_("End of presale text"),
         required=False,

src/pretix/control/templates/pretixcontrol/event/settings.html

@@ -92,6 +92,7 @@
                 {% bootstrap_field sform.presale_has_ended_text layout="control" %}
                 {% bootstrap_field sform.voucher_explanation_text layout="control" %}
                 {% bootstrap_field sform.confirm_text layout="control" %}
+                {% bootstrap_field sform.checkout_email_helptext layout="control" %}
             </fieldset>
             <fieldset>
                 <legend>{% trans "Shop design" %}</legend>

src/pretix/presale/forms/checkout.py

@@ -26,8 +26,6 @@ from pretix.presale.signals import contact_form_fields
 class ContactForm(forms.Form):
     required_css_class = 'required'
     email = forms.EmailField(label=_('E-mail'),
-                             help_text=_('Make sure to enter a valid email address. We will send you an order '
-                                         'confirmation including a link that you need to access your order later.'),
                              validators=[EmailBanlistValidator()],
                              widget=forms.EmailInput(attrs={'autocomplete': 'section-contact email'})
                              )
@@ -49,6 +47,7 @@ class ContactForm(forms.Form):
             # is an autofocus field. Who would have thought… See e.g. here:
             # https://floatboxjs.com/forum/topic.php?post=8440&usebb_sid=2e116486a9ec6b7070e045aea8cded5b#post8440
             self.fields['email'].widget.attrs['autofocus'] = 'autofocus'
+        self.fields['email'].help_text = self.event.settings.checkout_email_helptext
 
         responses = contact_form_fields.send(self.event, request=self.request)
         for r, response in responses: