Bip39 Github. Though there are actually BIP39 wordlists in languages apart from English, it is actually strongly not advised to use non-English words for wallet backups. It would make restoring the wallet challenging or impossible. Entropy is a complicated feature. Your mnemonic could be insecure if this aspect is used https://fatallisto.com/story8397478/bip39-generator-https-linktr-ee-bip39-5-easy-facts-about-bip39-generator-described