Bip39 Passphrase. Whilst you can find BIP39 wordlists in languages other than English, it is actually strongly not encouraged to implement non-English words for wallet backups. It might make restoring the wallet tricky or extremely hard. BIP39 specifies a list of 2048 words from which the mnemonic phrase is picked. https://socialmediaentry.com/story4064334/bip39-wallets-https-linktr-ee-bip39-the-fact-about-bip39-wallets-that-no-one-is-suggesting