Allow import bank data from CSV files

src/pretix/control/context.py

@@ -8,7 +8,7 @@ def contextprocessor(request):
     Adds data to all template contexts
     """
     url = resolve(request.path_info)
-    if url.namespace != 'control':
+    if not request.path.startswith('/control'):
         return {}
     ctx = {
         'url_name': url.url_name,