How can I override JavaScript settings used by a contributed module?
As those strings are passed to t() the faster way to rewrite those strings is to overwrite then in the settings.php file, using something similar to the following code (write only the code for the Drupal version you are using):

// Drupal 6.
$conf['locale_custom_strings_en'] = array(
  'Saving your vote' =&gt; 'Saving your rating',
  'Your vote has been saved' =&gt; 'Your rating has been saved',
  'Deleting your vote...' =&gt; 'Deleting your rating...',
  'Your vote has been deleted.' =&gt; 'Your rating has been deleted.'
);

// Drupal 7.
$conf['locale_custom_strings_en'][''] = array(
  'Saving your vote' =&gt; 'Saving your rating',
  'Your vote has been saved' =&gt; 'Your rating has been saved',
  'Deleting your vote...' =&gt; 'Deleting your rating...',
  'Your vote has been deleted.' =&gt; 'Your rating has been deleted.'
);