Bip39 Ian Coleman. Whilst there are BIP39 wordlists in languages in addition to English, it truly is strongly not recommended to work with non-English words for wallet backups. It'd make restoring the wallet tricky or difficult. BIP39 specifies a list of 2048 words from which the mnemonic phrase is picked. https://bookmarksea.com/story19112295/bip39-passphrase-https-linktr-ee-bip39-a-review-of-bip39-generator