fixup! Force default-zpublisher-encoding to utf-8

zope.conf default encoding is also used for responses and converters, so
for consistency we should also force default encoding there.
This is especially useful when running tests, because zope.conf is not
used and default values are used.

product/ERP5Type/patches/default_zpublisher_encoding.py

@@ -27,6 +27,10 @@
 ##############################################################################
 
 import ZPublisher.HTTPRequest
+import ZPublisher.HTTPResponse
+import ZPublisher.Converters
 
 # Force (do not depend on) the default-zpublisher-encoding setting of zope.conf
 ZPublisher.HTTPRequest.default_encoding = 'utf-8'
+ZPublisher.HTTPResponse.default_encoding = 'utf-8'
+ZPublisher.Converters.default_encoding = 'utf-8'