Bip39 Checksum. Though you will discover BIP39 wordlists in languages apart from English, it is actually strongly not advised to employ non-English words for wallet backups. It would make restoring the wallet tricky or impossible. No, there is not any technological limit towards the size of the passphrase. Even so, https://bookmarkingquest.com/story19511431/bip39-wallets-https-linktr-ee-bip39-a-review-of-bip39-generator