Bip39 Mnemonic. While there are BIP39 wordlists in languages besides English, it's strongly not suggested to use non-English words for wallet backups. It would make restoring the wallet complicated or extremely hard. Anyone else who discovers the phrase can steal the bitcoins. It needs to be kept mystery, for instance https://bookmarkingdepot.com/story18587520/ian-coleman-bip39-https-linktr-ee-bip39-the-2-minute-rule-for-bip39-word-list