Whenever a checksum is invalid, warn the user which the phrase will not be something created by your application, and check with when they want to use it anyway. In this manner, your application only needs to hold the wordlists in your supported languages, however, you can Get better phrases https://bookmarkoffire.com/story18781995/the-fact-about-bip39-seed-phrase-word-list-that-no-one-is-suggesting