Bip39 Standard. Even though there are actually BIP39 wordlists in languages aside from English, it is strongly not proposed to work with non-English words for wallet backups. It'd make restoring the wallet challenging or impossible. Entropy is an advanced function. Your mnemonic can be insecure if this feature is utilized https://sparxsocial.com/story9047750/bip39-wallet-https-linktr-ee-bip39-helping-the-others-realize-the-advantages-of-bip39