Bip39. Although there are actually BIP39 wordlists in languages aside from English, it's strongly not proposed to work with non-English words for wallet backups. It'd make restoring the wallet challenging or impossible. No, there isn't any technical Restrict on the size of one's passphrase. However, to the sake of memorability https://socialmediainuk.com/story21895759/bip39-wallet-https-linktr-ee-bip39-not-known-factual-statements-about-bip39-list