Switch ugettext to ugettext_lazy in models.py

Author: Jesse Shapiro

AUTHORS.rst

@@ -38,6 +38,7 @@ Authors
 - Lucas Wiman
 - Michael England
 - Gregory Bataille
+- Jesse Shapiro
 
 Background
 ==========

CHANGES.rst

@@ -1,6 +1,10 @@
 Changes
 =======
 
+Unreleased
+----------
+- Change ugettext calls in models.py to ugettext_lazy
+
 1.9.0 (2017-06-11)
 ------------------
 - Add --batchsize option to the populate_history management command. (gh-231)

simple_history/models.py

@@ -11,7 +11,7 @@
 from django.utils import six
 from django.utils.encoding import python_2_unicode_compatible, smart_text
 from django.utils.timezone import now
-from django.utils.translation import string_concat, ugettext as _
+from django.utils.translation import string_concat, ugettext_lazy as _
 
 from . import exceptions
 from .manager import HistoryDescriptor