Bip39 Mnemonic. While you'll find BIP39 wordlists in languages in addition to English, it really is strongly not advised to implement non-English words for wallet backups. It might make restoring the wallet tough or extremely hard. BIP39 specifies a list of 2048 words from which the mnemonic phrase is chosen. https://cruxbookmarks.com/story18842186/bip39-words-https-linktr-ee-bip39-not-known-details-about-bip39-list