Bip39 Vs Slip39. Though there are actually BIP39 wordlists in languages aside from English, it truly is strongly not recommended to implement non-English words for wallet backups. It might make restoring the wallet challenging or unattainable. BIP39 specifies a list of 2048 words from which the mnemonic phrase is selected. https://bookmarketmaven.com/story19390479/bip39-wallets-https-linktr-ee-bip39-a-review-of-bip39-word-list-pdf