Move cfpintro, additionalintro and welcomemail from db to templates

This moves these large-text fields out of the database and into the
templates, which makes them a lot easier to edit there, and will make it
possible to use better HTML templating and such in the future.

cfpintro can be set either using a full template block override or using
a property called system.cfp.intro.
additionalintro can for now only be set as a property,
system.reg.additionalintro.

In passing also add a system.reg.voucherintro to override the default
text introducing what to do with vouchers.

As of this, require the template confreg/mail/welcomemail.txt to exist
in the skin directory to make it possible to send welcome emails.
Previously there was a default content for this file that just included
the database property as the entire text, but from this it requires a
complete file in the skin. The fact that it exists is validated when
trying to turn on either welcome email or tickets.

Also create a new model for ConferenceRemovedData where we persist the
current values for these fields, since the database content isn't under
version control, in case it needs to be recovered later.

1 files changed, 7 insertions, 0 deletions

diff --git a/postgresqleu/confreg/admin.py b/postgresqleu/confreg/admin.py
index dd7f4828..1875c281 100644
--- a/postgresqleu/confreg/admin.py
+++ b/postgresqleu/confreg/admin.py
@@ -18,6 +18,7 @@ from .models import PendingAdditionalOrder
 from .models import VolunteerSlot
 from .models import AccessToken
 from .models import ConferenceNews
+from .models import ConferenceRemovedData
 
 from postgresqleu.util.forms import ConcurrentProtectedModelForm
 
@@ -513,6 +514,11 @@ class VolunteerSlotAdmin(admin.ModelAdmin):
     list_display = ('__str__', 'title')
 
 
+class ConferenceRemovedDataAdmin(admin.ModelAdmin):
+    list_filter = ['urlname', ]
+    list_display = ('urlname', 'description')
+
+
 admin.site.register(ConferenceSeries, ConferenceSeriesAdmin)
 admin.site.register(Conference, ConferenceAdmin)
 admin.site.register(RegistrationClass, RegistrationClassAdmin)
@@ -536,3 +542,4 @@ admin.site.register(PendingAdditionalOrder, PendingAdditionalOrderAdmin)
 admin.site.register(VolunteerSlot, VolunteerSlotAdmin)
 admin.site.register(AccessToken)
 admin.site.register(ConferenceNews)
+admin.site.register(ConferenceRemovedData, ConferenceRemovedDataAdmin)