add support for utf8 in sequences, verticals and custom modules.

common/test/data/full/html/schematic_tutorial.html

@@ -9,14 +9,14 @@ the right of the diagram area) and drag it onto the diagram.  Release
 the mouse when the component is in the correct position.
 </td>
 </tr>
-
+<!-- note that entities like &mdash; may be used. -->
 <tr>
 <td>Move a component</td>
 <td>Click to select a component in the diagram (it will turn green)
 and then drag it to its new location.  You can use shift-click to add
 a component to the current selection.  Or you can click somewhere in
 the diagram that is not on top of a component and drag out a selection
-rectangle -- components intersecting the rectangle will be added to
+rectangle &mdash; components intersecting the rectangle will be added to
 the current selection.
 </td>
 </tr>
@@ -63,7 +63,7 @@ engineeering notation:
 <td>Add a wire</td>
 <td>Wires start at connection points, the open circles that
 appear at the terminals of components or the ends of wires.
-Click on a connection point to start a wire -- a green wire
+Click on a connection point to start a wire &mdash; a green wire
 will appear with one end anchored at the starting point.
 Drag the mouse and release the mouse button when the other
 end of the wire is positioned as you wish.  Once a wire has