def standardize_tag(lang: str, caller: Any | None = None) -> tuple[Language, str]:
from langcodes import Language, standardize_tag as stdz_tag
standardized = stdz_tag(lang)
language = Language.get(standardized)
if not language.is_valid():
raise error(f"The language tag '{lang}' is not valid!", caller or standardize_tag)
return (language, language.to_tag())