Every time a checksum is invalid, warn the person which the phrase will not be one thing generated by your app, and ask whenever they wish to utilize it anyway. This way, your application only must keep the wordlists for the supported languages, however, you can recover phrases created by https://squareblogs.net/edelinepge/h1-b-recognizing-bip39-a-comprehensive-overview-to-mnemonic-expressions-and