fixes a few future imports and adds support for new python and wagtail versions

src/personalisation/adapters.py

@@ -1,3 +1,4 @@
+from __future__ import absolute_import, unicode_literals
 import time
 
 from django.db.models import F

src/personalisation/blocks.py

@@ -1,24 +1,22 @@
+from __future__ import absolute_import, unicode_literals
+
 from wagtail.wagtailcore import blocks
 from personalisation.models import Segment
 
+
 def list_segment_choices():
-     
     for s in Segment.objects.all():
         yield (s.pk, s.name)
 
 
-
 class PersonalisedStructBlock(blocks.StructBlock):
-
     segment = blocks.ChoiceBlock(
         choices=list_segment_choices, 
-        required=False, label="Personalisation segment",
-        help_text="Only show this content block for users in this segment")
-
+        required=False, label=_("Personalisation segment"),
+        help_text=_("Only show this content block for users in this segment"))
 
     def render(self, value, context=None):
         """Only render this content block for users in this segment"""
-
         # TODO: move logic to its own class instead of getting it from the session
         user_segments = context['request'].session['segments']