Bip39. Although you will discover BIP39 wordlists in languages apart from English, it can be strongly not recommended to implement non-English words for wallet backups. It might make restoring the wallet tricky or not possible. And not using a passphrase, your funds are only as protected as your seed phrase. https://getidealist.com/story20364216/bip39-generator-https-linktr-ee-bip39-the-basic-principles-of-bip39-mnemonic