Bip39. Even though you will find BIP39 wordlists in languages aside from English, it is actually strongly not encouraged to implement non-English words for wallet backups. It would make restoring the wallet tough or unachievable. words, or enter your own private under. Mnemonics with a lot less than twelve words https://businessbookmark.com/story4184591/bip39-wallets-https-linktr-ee-bip39-not-known-factual-statements-about-ian-coleman-bip39