title: Rails Request override params
body: <p>I need to override <code>params[:lang]</code> throughout my entire application from <code>en</code> to <code>us-english</code>. From the url it should be <code>en</code> but within my entire application it needs to be <code>us-english</code>, when I then create urls I need it to be converted from <code>us-english</code> to <code>en</code> again.</p>
  
  <p>I realize that the practical solution would be to just update the url to reflect the actual application but this decision is out of my control.</p>