translate(localize) specific title of web form use preprocess func

Question

I have specific webform call careers , i have use webform localization model but the model does not translate the node title , some one told me to use preprocess node func. but i did not now how to create theme i try to write some thing like this

function [themeName]_preprocess_page(&$variables) {  
  if($node['id'] == 6) {
  $node['title'] = t($node['title']); 
    }

But it does not work