def METHOD_NAME(self, string_type: StringType, index: int, language: Optional[LanguageLike] = None) -> str:
    """
    Returns the value of a string in the big string file for the given language, starting from the offset
    defined by the string_type.
    If language is not set, the default ROM language is used.
    """
    model = self.get_model(language)
    return model.strings[self.get_index(string_type, index)]