Comment 1 for bug 1512542

This bug's been present since the beginning. The "mobileuploadnotenabled" string was defined in lang/auth.php, but the call to get_string() looked for in lang/account.php, so that explains the error.

I'm changing the call to get_string() to look in auth.php, since it'll already be translated there, and it nicely groups together all the mobileupload error strings in one file.