language_map = {
    # Chinese
    "chinese": "Chinese",
    "zh": "Chinese",
    "zh-cn": "Chinese",
    "zh-tw": "Chinese",
    "zh-hans": "Chinese",
    "zh-hant": "Chinese",

    # English
    "english": "English",
    "en": "English",
    "en-us": "English",
    "en-gb": "English",
    "eng": "English",

    # Japanese
    "japanese": "Japanese",
    "jp": "Japanese",
    "ja": "Japanese",
    "nihongo": "Japanese",
}


def normalize_language(lang: str) -> str:
    return language_map.get(lang.lower(), lang)