Fixed #18240 -- Made admindocs tests pass even when language is not en.

Thanks miguel.ventura@gmail.com for the report and the patch.

django/contrib/admindocs/tests/__init__.py

@@ -1,6 +1,7 @@
 from django.contrib.admindocs import views
 from django.db.models import fields as builtin_fields
 from django.utils import unittest
+from django.utils.translation import ugettext as _
 
 import fields
 
@@ -17,15 +18,17 @@ class TestFieldType(unittest.TestCase):
     def test_builtin_fields(self):
         self.assertEqual(
             views.get_readable_field_data_type(builtin_fields.BooleanField()),
-            u'Boolean (Either True or False)'
+            _(u'Boolean (Either True or False)')
         )
 
     def test_custom_fields(self):
         self.assertEqual(
             views.get_readable_field_data_type(fields.CustomField()),
-            u'A custom field type'
+            _(u'A custom field type')
         )
         self.assertEqual(
             views.get_readable_field_data_type(fields.DescriptionLackingField()),
-            u'Field of type: DescriptionLackingField'
+            _(u'Field of type: %(field_type)s') % {
+                'field_type': 'DescriptionLackingField'
+            }
         )