Move toggle line numbers from toolbar to "View" menu

notebook/static/notebook/js/maintoolbar.js

@@ -55,7 +55,6 @@ define([
             'run_int'],
          ['<add_celltype_list>'],
          [['jupyter-notebook:show-command-palette']],
-         [['jupyter-notebook:toggle-all-line-numbers']],
          ['<add_celltoolbar_reminder>']
         ];
         this.construct(grps);

notebook/static/notebook/js/menubar.js

@@ -211,6 +211,7 @@ define([
             '#move_cell_down': 'move-cell-down',
             '#toggle_header': 'toggle-header',
             '#toggle_toolbar': 'toggle-toolbar',
+            '#toggle_line_numbers': 'toggle-all-line-numbers',
             '#insert_cell_above': 'insert-cell-above',
             '#insert_cell_below': 'insert-cell-below',
             '#run_cell': 'run-cell',

notebook/templates/notebook.html

@@ -154,10 +154,16 @@ data-notebook-path="{{notebook_path | urlencode}}"
                     <ul id="view_menu" class="dropdown-menu">
                         <li id="toggle_header"
                             title="Show/Hide the logo and notebook title (above menu bar)">
-                            <a href="#">Toggle Header</a></li>
+                            <a href="#">Toggle Header</a>
+                        </li>
                         <li id="toggle_toolbar"
                             title="Show/Hide the action icons (below menu bar)">
-                            <a href="#">Toggle Toolbar</a></li>
+                            <a href="#">Toggle Toolbar</a>
+                        </li>
+                        <li id="toggle_line_numbers"
+                            title="Show/Hide line numbers in cells">
+                            <a href="#">Toggle Line Numbers</a>
+                        </li>
                         <li id="menu-cell-toolbar" class="dropdown-submenu">
                             <a href="#">Cell Toolbar</a>
                             <ul class="dropdown-menu" id="menu-cell-toolbar-submenu"></ul>