Bip39. While you'll find BIP39 wordlists in languages in addition to English, it truly is strongly not recommended to implement non-English words for wallet backups. It might make restoring the wallet challenging or impossible. BIP39 specifies a list of 2048 words from which the mnemonic phrase is selected. Just about https://listbell.com/story8345549/bip39-mnemonic-https-linktr-ee-bip39-the-basic-principles-of-bip39-mnemonic