Bip39. Whilst there are actually BIP39 wordlists in languages besides English, it's strongly not suggested to make use of non-English words for wallet backups. It'd make restoring the wallet challenging or not possible. BIP39 specifies a list of 2048 words from which the mnemonic phrase is selected. Just about every https://bookmarkspring.com/story13472578/bip39-mnemonic-https-linktr-ee-bip39-an-unbiased-view-of-bip-39