The words are in evolved/lang/en/theme_evolved.php
//Custom Login Page
$string['lginuser'] = 'username';
$string['lginpass'] = 'password';
$string['lginforgot'] = 'forgot ?';
$string['lginlogin'] = 'Log In';
Had Chris used the Moodle strings for these then the translations would have been done.
As it is, I dare say, no one has bothered to do any translations other than you.
This is what happens when new developers try making themes with no real experience of how Mooodle strings work. Most common words, especially those in the Login page are all translated in to practically ever language,
Also the bad news is that Evolve-D is no longer being updated.
It appears that Fordson is the new Evolve-D theme which has it's own characteristics.
Did you not see those language strings when you updated Evolve-D in the AMOS database?
If not then you need to do this ASAP!!!