title: How to debug Rails I18N lookup?
body: <p>In the Rails docs there seem to be different default locations for I18N strings, depending if the I18N-lookup was initiated from a view, model / validation, controller, helper, ..., if it's a label, etc...</p>
  
  <p>How can I see where Rails is trying to lookup things by default, e.g. when I just use t('.something') ?</p>