Fix #379 -- Add logo to event organizers (#431)

* [WIP] Add logo to event organizers.

* Fix indentation issues.

* Refactor code

Refactor code

Refactor code

* Add new migration

* Take files into account for organizer sform (settings form)

* Fix grammer

* Make bootstrap form errors specific to each fieldset

* Display logo on organizer's page

* Fix PR issues

Fix PR issues

Fix PR issues

* Reorder imports

* Remove conflicting migration

* Fix rebase conflict

src/pretix/control/forms/organizer.py

@@ -2,8 +2,9 @@ from django import forms
 from django.core.exceptions import ValidationError
 from django.utils.translation import ugettext_lazy as _
 
-from pretix.base.forms import I18nModelForm
+from pretix.base.forms import I18nModelForm, SettingsForm
 from pretix.base.models import Organizer, Team
+from pretix.control.forms import ExtFileField
 from pretix.multidomain.models import KnownDomain
 
 
@@ -98,3 +99,14 @@ class TeamForm(forms.ModelForm):
                                         'the permission to change teams and permissions.'))
 
         return data
+
+
+class OrganizerSettingsForm(SettingsForm):
+
+    organizer_logo_image = ExtFileField(
+        label=_('Logo image'),
+        ext_whitelist=(".png", ".jpg", ".svg", ".gif", ".jpeg"),
+        required=False,
+        help_text=_('If you provide a logo image, we will by default not show your organization name '
+                    'in the page header. We will show your logo with a maximal height of 120 pixels.')
+    )