title: How can I override translations on a plone 4 instance basis
body: <p>I have a zope instance with many plone sites each for different customers. I want override particular translations such as the date format just for a single plone site without affecting the others. How do I do this?</p>
  
  <p>Tutorials such as <a href="http://maurits.vanrees.org/weblog/archive/2010/10/i18n-plone-4#overriding-translations" rel="nofollow">http://maurits.vanrees.org/weblog/archive/2010/10/i18n-plone-4#overriding-translations</a> seem to indicate custom translations override all sites on a zope instance.</p>