I would suggest trying to modify the php file directly. The line you're looking for is line 80 of forcepasswordchange.php:
$app->redirect(
"index.php?option=".$editProfileOption."&view=".$editProfileView."&layout=".$editProfileLayout,
$this->params->get("message", "You must update your password before continuing to use the site.")
);
Change it to:
$app->redirect(
"index.php?option=".$editProfileOption."&view=".$editProfileView."&layout=".$editProfileLayout,
"YOUR MESSAGE HERE"
);
That should fix your issue, and hopefully accept the language formatting you need. We'll take note of language issues with textboxes in the future so that we hopefully avoid this problem. I think language files would not have this issue, but they take a little more effort to configure for some users.
How to change the message to Chinese
