'Get a CRUD string
@param tablename: the table name
@param name: the name of the CRUD string'

@staticmethod
def crud_string(tablename, name):

    crud_strings = current.response.s3.crud_strings
    _crud_strings = crud_strings.get(tablename, crud_strings)
    return _crud_strings.get(name, crud_strings.get(name, None))
