Make available languages configurable

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

@@ -19,6 +19,7 @@
         </fieldset>
         <fieldset>
             <legend>{% trans "Display settings" %}</legend>
+            {% bootstrap_field sform.locales layout="horizontal" %}
             {% bootstrap_field sform.locale layout="horizontal" %}
             {% bootstrap_field sform.timezone layout="horizontal" %}
             {% bootstrap_field sform.show_date_to layout="horizontal" %}

src/pretix/control/views/__init__.py

@@ -0,0 +1,28 @@
+from django.views.generic import edit
+
+
+class EventBasedFormMixin:
+
+    def get_form_kwargs(self):
+        kwargs = super().get_form_kwargs()
+        if hasattr(self.request, 'event'):
+            kwargs['event'] = self.request.event
+        return kwargs
+
+
+class CreateView(EventBasedFormMixin, edit.CreateView):
+    """
+    Like Django's default CreateView, but passes the optional event
+    argument to the form. This is necessary for I18nModelForms to work
+    properly.
+    """
+    pass
+
+
+class UpdateView(EventBasedFormMixin, edit.UpdateView):
+    """
+    Like Django's default UpdateView, but passes the optional event
+    argument to the form. This is necessary for I18nModelForms to work
+    properly.
+    """
+    pass

src/pretix/control/views/event.py

@@ -2,7 +2,6 @@ from collections import OrderedDict
 from django.conf import settings
 from django.shortcuts import render, redirect
 from django.utils.functional import cached_property
-from django.views.generic.edit import UpdateView
 from django.views.generic.base import TemplateView
 from django.views.generic.detail import SingleObjectMixin
 from django import forms
@@ -15,6 +14,7 @@ from pretix.base.forms import VersionedModelForm, SettingsForm
 from pretix.base.models import Event
 from pretix.base.signals import register_payment_providers
 from pretix.control.permissions import EventPermissionRequiredMixin
+from . import UpdateView
 
 
 class EventUpdateForm(VersionedModelForm):
@@ -71,9 +71,13 @@ class EventSettingsForm(SettingsForm):
         choices=((a, a) for a in common_timezones),
         label=_("Default timezone"),
     )
+    locales = forms.MultipleChoiceField(
+        choices=settings.LANGUAGES,
+        label=_("Available langauges"),
+    )
     locale = forms.ChoiceField(
         choices=settings.LANGUAGES,
-        label=_("Default locale"),
+        label=_("Default language"),
     )
     user_mail_required = forms.BooleanField(
         label=_("Require e-mail adresses"),

src/pretix/control/views/forms.py

@@ -3,6 +3,7 @@ from itertools import product
 from django import forms
 from django.core.exceptions import ValidationError
 from django.db import transaction
+from django.forms import BaseInlineFormSet
 from django.forms.widgets import flatatt
 from django.utils.encoding import force_text
 from django.utils.html import format_html
@@ -13,6 +14,20 @@ from pretix.base.forms import VersionedModelForm
 from pretix.base.models import ItemVariation, Item
 
 
+class I18nInlineFormSet(BaseInlineFormSet):
+    """
+    This is equivalent to a normal BaseInlineFormset, but cares for the special needs
+    of I18nForms (see there for more information).
+    """
+    def __init__(self, *args, **kwargs):
+        self.event = kwargs.pop('event', None)
+        super().__init__(*args, **kwargs)
+
+    def _construct_form(self, i, **kwargs):
+        kwargs['event'] = self.event
+        return super()._construct_form(i, **kwargs)
+
+
 class TolerantFormsetModelForm(VersionedModelForm):
     """
     This is equivalent to a normal VersionedModelForm, but works around a problem that

src/pretix/control/views/item.py

@@ -4,7 +4,7 @@ from django.forms import BooleanField, ModelForm
 from django.utils.functional import cached_property
 
 from django.views.generic import ListView
-from django.views.generic.edit import CreateView, UpdateView, DeleteView
+from django.views.generic.edit import DeleteView
 from django.views.generic.base import TemplateView
 from django.views.generic.detail import SingleObjectMixin
 from django.core.urlresolvers import resolve, reverse
@@ -12,14 +12,15 @@ from django.http import HttpResponseRedirect, HttpResponseForbidden
 from django.shortcuts import redirect
 from django.forms.models import inlineformset_factory
 from django.utils.translation import ugettext_lazy as _
-from pretix.base.forms import VersionedModelForm
+from pretix.base.forms import VersionedModelForm, I18nModelForm
 
 from pretix.base.models import (
     Item, ItemCategory, Property, ItemVariation, PropertyValue, Question, Quota,
     Versionable)
 from pretix.control.permissions import EventPermissionRequiredMixin, event_permission_required
-from pretix.control.views.forms import TolerantFormsetModelForm, VariationsField
+from pretix.control.views.forms import TolerantFormsetModelForm, VariationsField, I18nInlineFormSet
 from pretix.control.signals import restriction_formset
+from . import UpdateView, CreateView
 
 
 class ItemList(ListView):
@@ -215,6 +216,7 @@ class PropertyUpdate(EventPermissionRequiredMixin, UpdateView):
         formsetclass = inlineformset_factory(
             Property, PropertyValue,
             form=PropertyValueForm,
+            formset=I18nInlineFormSet,
             can_order=True,
             extra=0,
         )
@@ -269,6 +271,7 @@ class PropertyCreate(EventPermissionRequiredMixin, CreateView):
         formsetclass = inlineformset_factory(
             Property, PropertyValue,
             form=PropertyValueForm,
+            formset=I18nInlineFormSet,
             can_order=True,
             extra=3,
         )
@@ -440,7 +443,7 @@ class QuotaList(ListView):
         ).prefetch_related("items")
 
 
-class QuotaForm(ModelForm):
+class QuotaForm(I18nModelForm):
 
     def __init__(self, **kwargs):
         items = kwargs['items']