Fix test to translate read field

The test was using the field name instead of the field instance.
It is better to keep the usual convention of using fname for name and field for
the instance.

issue6208
review33011002

trytond/model/modelsql.py

@@ -725,15 +725,17 @@ class ModelSQL(ModelStorage):
 
         for column in columns:
             # Split the output name to remove SQLite type detection
-            field = column.output_name.split()[0]
-            if field == '_timestamp':
+            fname = column.output_name.split()[0]
+            if fname == '_timestamp':
                 continue
-            if (getattr(cls._fields[field], 'translate', False)
+            field = cls._fields[fname]
+            if (getattr(field, 'translate', False)
                     and not hasattr(field, 'get')):
-                translations = Translation.get_ids(cls.__name__ + ',' + field,
-                    'model', Transaction().language, ids)
+                translations = Translation.get_ids(
+                    cls.__name__ + ',' + fname, 'model',
+                    Transaction().language, ids)
                 for row in result:
-                    row[field] = translations.get(row['id']) or row[field]
+                    row[fname] = translations.get(row['id']) or row[fname]
 
         # all fields for which there is a get attribute
         getter_fields = [f for f in