Bip39 Seed. Whilst you can find BIP39 wordlists in languages apart from English, it is actually strongly not advisable to make use of non-English words for wallet backups. It would make restoring the wallet complicated or extremely hard. No, there is no specialized limit towards the length of the passphrase. https://wiishlist.com/story19235761/bip39-wallet-https-linktr-ee-bip39-not-known-factual-statements-about-ian-coleman-bip39