Bip39. Even though there are BIP39 wordlists in languages aside from English, it can be strongly not suggested to employ non-English words for wallet backups. It might make restoring the wallet complicated or extremely hard. Entropy is an advanced function. Your mnemonic might be insecure if this element is used https://thejillist.com/story8761256/bip-39-https-linktr-ee-bip39-the-fact-about-bip39-words-that-no-one-is-suggesting