On a multi language site it is desirable to translate the drupal English into the customers Englich likings.

Steps taken

1. Goto /admin/settings/language/add
   1. Add a custom languages with language prefix en, name en-ours, english English @ Our place and native English @ Our Place
   2. Make your new language the default.
   3. Disable drupal's en
   4. Change the name en-ours into en