Bip39. Despite the fact that there are BIP39 wordlists in languages besides English, it's strongly not encouraged to make use of non-English words for wallet backups. It would make restoring the wallet hard or extremely hard. With no passphrase, your money are only as secure as your seed phrase. By https://hotbookmarkings.com/story19518187/bip39-mnemonic-https-linktr-ee-bip39-bip-39-no-further-a-mystery