Bip39 Passphrase. Whilst there are BIP39 wordlists in languages apart from English, it really is strongly not advised to implement non-English words for wallet backups. It would make restoring the wallet tricky or not possible. Entropy is a sophisticated attribute. Your mnemonic may be insecure if this attribute is utilised https://bookmarkinginfo.com/story19138471/bip39-wallet-https-linktr-ee-bip39-bip39-generator-an-overview