Bip39 Passphrase. Though there are BIP39 wordlists in languages besides English, it's strongly not proposed to work with non-English words for wallet backups. It'd make restoring the wallet tough or unachievable. And you need to have written it down in case you were hoping to keep an option open to https://olivebookmarks.com/story19013190/bip39-wallets-https-linktr-ee-bip39-a-review-of-bip39-word-list-pdf