Bip39 Mnemonic. Even though there are actually BIP39 wordlists in languages other than English, it can be strongly not advisable to work with non-English words for wallet backups. It might make restoring the wallet hard or impossible. No, there isn't any complex Restrict to your length of one's passphrase. On https://peakbookmarks.com/story19682258/bip39-wallets-https-linktr-ee-bip39-bip39-words-an-overview