def get_selection_name(env, model, field, value):
return dict(env[model].fields_get(field, 'selection').get(field, {}).get('selection',{})).get(value)# usage
get_selection_name(request.env, 'sale.order', 'general_status', 'draft') # 'Draft'
get_selection_name(self.env, 'sale.order', 'general_status', 'draft') # 'Draft'
