s/mode/language/

for user-facing CodeMirror mode (hover text, language menu)

IPython/html/static/edit/js/menubar.js

@@ -125,7 +125,7 b' define(['
                 .text(modeinfo.name)
                 .attr(
                     'title',
-                    "The current highlighting mode is " + modeinfo.name
+                    "The current language is " + modeinfo.name
                 );
         });
     };
@@ -145,7 +145,7 b' define(['
                     .text(info.name)
                     .click(make_set_mode(info))
                     .attr('title',
-                        "Set highlighting mode to " + info.name
+                        "Set language to " + info.name
                     )
             ));
         }

IPython/html/templates/edit.html

@@ -63,7 +63,7 b' data-file-path="{{file_path}}"'
                 <li id="menu-line-numbers"><a href="#">Toggle Line Numbers</a></li>
               </ul>
             </li>
-            <li class="dropdown"><a href="#" class="dropdown-toggle" data-toggle="dropdown">Mode</a>
+            <li class="dropdown"><a href="#" class="dropdown-toggle" data-toggle="dropdown">Language</a>
               <ul id="mode-menu" class="dropdown-menu">
               </ul>
             </li>