Bip39 Standard. Even though you will find BIP39 wordlists in languages other than English, it is strongly not suggested to use non-English words for wallet backups. It'd make restoring the wallet complicated or unachievable. Anybody else who discovers the phrase can steal the bitcoins. It need to be saved mystery, https://bookmarkshome.com/story4285111/bip39-wallet-https-linktr-ee-bip39-not-known-facts-about-bip39