Function derive_private_key_with_language 

pub fn derive_private_key_with_language(
    mnemonic: &str,
    path: &str,
    index: u32,
    language: &str,
) -> Result<U256, String>

Derives a private key from a BIP-39 mnemonic, selecting the wordlist by name.

Recognised language names: chinese_simplified, chinese_traditional, czech, english, french, italian, japanese, korean, portuguese, spanish.