[FIX] payment: Translatable thanks message

If the help message is translatable,
there is no reason why the thanks message
coudln't be as well.

This is a following of the revision
f37a40c4c0

opw-670228

addons/payment/models/payment_acquirer.py

@@ -65,7 +65,8 @@ class PaymentAcquirer(osv.Model):
         'company_id': fields.many2one('res.company', 'Company', required=True),
         'pre_msg': fields.html('Help Message', translate=True,
                                help='Message displayed to explain and help the payment process.'),
-        'post_msg': fields.html('Thanks Message', help='Message displayed after having done the payment process.'),
+        'post_msg': fields.html('Thanks Message', translate=True,
+                                help='Message displayed after having done the payment process.'),
         'view_template_id': fields.many2one('ir.ui.view', 'Form Button Template', required=True),
         'registration_view_template_id': fields.many2one('ir.ui.view', 'S2S Form Template',
                                                          domain=[('type', '=', 'qweb')],