Bip39 Words. Despite the fact that there are BIP39 wordlists in languages besides English, it is strongly not encouraged to work with non-English words for wallet backups. It might make restoring the wallet hard or difficult. BIP39 specifies a list of 2048 words from which the mnemonic phrase is preferred. https://bookmarklethq.com/story18638331/bip39-https-linktr-ee-bip39-the-basic-principles-of-bip39-mnemonic