[FIX] base: single lang behaviour

If a db is in single lang (en_US or not) but still has translations, the
translation should be updated in addition to updating the referenced record
Add tests to formalise the expected behaviour:

If one language only (en_US or not), when writing on a translatable field:
- record field should updated
- value of potential existing en_US translation should be updated
- src of potential existing translations should be updated
- no new translation should be created

If en_US and fr_FR, when writing on a translatable field in en_US:
- record field should updated
- value of potential existing en_US translation should be updated
- src of potential existing translations should be updated
- new en_US translation should be created if was not present

If en_US and fr_FR, when writing on a translatable field in fr_FR:
- record field should not be updated
- value of potential existing fr_FR translation should be updated
- src of potential existing translations should not be updated
- new fr_FR translation should be created if was not present

Adapt test_new_api test
get_installed is ormcached, just putting active = True is not enough

1 files changed, 1 insertions, 2 deletions

diff --git a/odoo/addons/test_new_api/tests/test_new_fields.py b/odoo/addons/test_new_api/tests/test_new_fields.py
index b8f254e512f..d372f6f23ae 100644
--- a/odoo/addons/test_new_api/tests/test_new_fields.py
+++ b/odoo/addons/test_new_api/tests/test_new_fields.py
@@ -1230,8 +1230,7 @@ class TestFields(common.TransactionCase):
         email = self.env.ref('test_new_api.emailmessage_0_0')
         self.assertEqual(email.message, message)
 
-        french = self.env['res.lang']._lang_get('fr_FR')
-        french.active = True
+        self.env['res.lang'].load_lang('fr_FR')
 
         def count(msg):
             # return the number of translations of msg.label