Bip39 Mnemonic Code Converter Tool. While there are BIP39 wordlists in languages other than English, it is strongly not encouraged to use non-English words for wallet backups. It would make restoring the wallet complicated or extremely hard. No, there isn't a complex limit on the length of one's passphrase. Nonetheless, https://socialevity.com/story20734492/bip39-passphrase-https-linktr-ee-bip39-how-much-you-need-to-expect-you-ll-pay-for-a-good-bip39-generator