Bip39. While you will find BIP39 wordlists in languages apart from English, it really is strongly not advised to work with non-English words for wallet backups. It'd make restoring the wallet complicated or unachievable. What constitutes a "very good wallet" is one that has apparent, simple to obtain documentation on https://livebackpage.com/story4594421/bip39-wallets-https-linktr-ee-bip39-top-guidelines-of-bip39-words