Bip39 Passphrase. Even though there are actually BIP39 wordlists in languages aside from English, it is strongly not encouraged to utilize non-English words for wallet backups. It'd make restoring the wallet difficult or extremely hard. Entropy is an advanced aspect. Your mnemonic might be insecure if this characteristic is utilised https://bookmarkingfeed.com/story18571431/bip39-wallets-https-linktr-ee-bip39-top-guidelines-of-bip39-mnemonic