s/Notebooks/Files

IPython/html/templates/tree.html

@@ -22,7 +22,7 b' data-terminals-available="{{terminals_available}}"'
   <div id="ipython-main-app" class="container">
     <div id="tab_content" class="tabbable">
       <ul id="tabs" class="nav nav-tabs">
-        <li class="active"><a href="#notebooks" data-toggle="tab">Notebooks</a></li>
+        <li class="active"><a href="#notebooks" data-toggle="tab">Files</a></li>
         <li><a href="#running" data-toggle="tab">Running</a></li>
       {% if terminals_available %}
         <li><a href="#terminals" data-toggle="tab">Terminals</a></li>