diff --git a/odoo/addons/base/tests/test_base.py b/odoo/addons/base/tests/test_base.py
index 5a45f00e95c..806a9f7fdea 100644
--- a/odoo/addons/base/tests/test_base.py
+++ b/odoo/addons/base/tests/test_base.py
@@ -526,3 +526,8 @@ class TestGroups(TransactionCase):
         # create a cycle and check
         a.implied_ids = d
         self.assertFalse(a._check_m2m_recursion('implied_ids'))
+
+    def test_res_group_copy(self):
+        a = self.env['res.groups'].with_context(lang='en_US').create({'name': 'A'})
+        b = a.copy()
+        self.assertFalse(a.name == b.name)
diff --git a/odoo/models.py b/odoo/models.py
index 005b2412f7e..5eeef77ef4e 100644
--- a/odoo/models.py
+++ b/odoo/models.py
@@ -4363,7 +4363,7 @@ class BaseModel(object):
                 trans_name, source_id, target_id = get_trans(field, old, new)
                 domain = [('name', '=', trans_name), ('res_id', '=', source_id)]
                 new_val = new_wo_lang[name]
-                if old.env.lang:
+                if old.env.lang and callable(field.translate):
                     # the new value *without lang* must be the old value without lang
                     new_wo_lang[name] = old_wo_lang[name]
                 for vals in Translation.search_read(domain):
@@ -4372,6 +4372,7 @@ class BaseModel(object):
                     del vals['module']      # duplicated vals is not linked to any module
                     vals['res_id'] = target_id
                     if vals['lang'] == old.env.lang and field.translate is True:
+                        vals['source'] = old_wo_lang[name]
                         # the value should be the new value (given by copy())
                         vals['value'] = new_val
                     Translation.create(vals)