Base_getZODBHistoryList: add a space between "key:" and "value"

this makes it easier to select the value by copy and paste.
Without the space, when double clicking on "value" in "key:value",
all "key:value" gets selected, with the space, only "value" gets
selected.

bt5/erp5_core_test/TestTemplateItem/portal_components/test.erp5.testZODBHistory.py

@@ -139,7 +139,7 @@ class TestZODBHistory(ERP5TypeTestCase):
     document.edit(title='ネクセディ', default_address_city='千代田区')
     self.commit()
     _, change, = document.Base_getZODBHistoryList()
-    self.assertIn('title:ネクセディ', change.getProperty('changes'))
+    self.assertIn('title: ネクセディ', change.getProperty('changes'))
 
     # no encoding error
     document.Base_viewZODBHistory()
@@ -166,9 +166,9 @@ class TestZODBHistory(ERP5TypeTestCase):
     document.Base_viewZODBHistory()
 
     change, = document.Base_getZODBHistoryList()
-    self.assertIn('data:(binary)', change.getProperty('changes'))
-    self.assertIn('content_type:image/png', change.getProperty('changes'))
-    self.assertIn('title:ロゴ', change.getProperty('changes'))
+    self.assertIn('data: (binary)', change.getProperty('changes'))
+    self.assertIn('content_type: image/png', change.getProperty('changes'))
+    self.assertIn('title: ロゴ', change.getProperty('changes'))
 
 
 def test_suite():

bt5/erp5_upgrader/TestTemplateItem/portal_components/test.erp5.testUpgrader.py

@@ -786,7 +786,7 @@ class TestUpgrader(ERP5TypeTestCase):
   def stepCheckPersonTitleHistory(self, sequence=None):
     self.assertEqual(
       [x.changes for x in self.portal.person_module['1'].Base_getZODBHistoryList()[-3:]],
-      [('title:M. pre_upgrade',), ('title:M. upgrader',), ('title:M. post_upgrade',)])
+      [('title: M. pre_upgrade',), ('title: M. upgrader',), ('title: M. post_upgrade',)])
 
   def test_upgrade_activities_are_run_sequentially(self):
     """

product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/Base_getZODBHistoryList.py

@@ -16,7 +16,7 @@ def beautifyChange(change_dict):
         six.text_type(property_value, 'utf-8')
       except UnicodeDecodeError:
         property_value = '(binary)'
-    change_list.append('{}:{}'.format(property_name, property_value))
+    change_list.append('{}: {}'.format(property_name, property_value))
   return change_list
 
 try: