diff -r 6b3523f81f42 -r 26744ad37953 cubicweb/web/views/formrenderers.py
--- a/cubicweb/web/views/formrenderers.py	Fri Apr 05 17:21:14 2019 +0200
+++ b/cubicweb/web/views/formrenderers.py	Fri Apr 05 17:58:19 2019 +0200
@@ -37,8 +37,6 @@
 
 from warnings import warn
 
-from six import text_type
-
 from logilab.mtconverter import xml_escape
 from logilab.common.registry import yes
 
@@ -121,7 +119,7 @@
             data.insert(0, errormsg)
         # NOTE: we call unicode because `tag` objects may be found within data
         #       e.g. from the cwtags library
-        w(''.join(text_type(x) for x in data))
+        w(''.join(str(x) for x in data))
 
     def render_content(self, w, form, values):
         if self.display_progress_div: