Bip39 Words. Even though you will discover BIP39 wordlists in languages other than English, it's strongly not encouraged to make use of 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 picked. https://socialevity.com/story20863246/bip39-list-https-linktr-ee-bip39-bip39-words-an-overview