def METHOD_NAME(self):
    target_lang = super().METHOD_NAME()
    # If targetlanguage isn't set, we try to extract it from the filename path (if any).
    if target_lang is None and hasattr(self, "filename") and self.filename:
        parent_dir = os.path.split(os.path.dirname(self.filename))[1]
        match = re.search(r"^(\w*).lproj", parent_dir)
        if match is not None:
            target_lang = match.group(1)
            if target_lang.lower() == "base":
                target_lang = "en"
        else:
            target_lang = self.sourcelanguage
        # Cache it
        self.settargetlanguage(target_lang)
    return target_lang