Invoice addresses: Ask for a state in some countries (#1362)

* Invoice addresses: Ask for a state in some countries

* API, tests, noscript

* Fix shredder tests

* Add test for addresses with long state names

src/pretix/urls.py

@@ -4,6 +4,7 @@ from django.views.generic import RedirectView
 
 import pretix.control.urls
 import pretix.presale.urls
+from pretix.base.views import js_helpers
 
 from .base.views import cachedfiles, csp, health, js_catalog, metrics, redirect
 
@@ -17,6 +18,7 @@ base_patterns = [
     url(r'^metrics$', metrics.serve_metrics,
         name='metrics'),
     url(r'^csp_report/$', csp.csp_report, name='csp.report'),
+    url(r'^js_helpers/states/$', js_helpers.states, name='js_helpers.stats'),
     url(r'^api/v1/', include(('pretix.api.urls', 'pretixapi'), namespace='api-v1')),
     url(r'^api/$', RedirectView.as_view(url='/api/v1/'), name='redirect-api-version')
 ]