Altering text on Drupal login pages

PHP preprocess functions

function vod_preprocess_page(&$variables) {
   // dpm($variables);
    if ($variables['is_front'] == TRUE || arg(0) == 'home') {
        $variables['title'] = '';
    }
    if ($variables['logged_in'] == FALSE && arg(0) == 'user') {
        $variables['title'] = 'Sign In';
        $variables['login_link'] = '<a href="/user/password" class="return-text">Forgot password?</a>';
    }
    if ($variables['logged_in'] == FALSE && arg(1) == 'password') {
        $variables['title'] = 'Request Password';
        $variables['login_link'] = '<a href="/user" class="return-text">Cancel</a>';
    }
    if ($variables['logged_in'] == FALSE && arg(1) == 'register') {
        $variables['title'] = 'Create an Account';
        $variables['login_link'] = '<a href="/user" class="return-text">Cancel</a>';

        }
}