translation in plugin code

Dear Support-Team!

My question concerns the wordpress plugin of auth0. In the “WP_Auth0_Email_Verification.php” file on line 25:
$html = sprintf( '<p>%s</p>', __( 'This site requires a verified email address.', 'wp-auth0' ) );

I want to translate that to german, but if I overwrite it here and would update the plugin, the changes are gone. Is there a hook you can provide or do you have any other idea for me?

Thanks in advance,
best Florian