make installation directions clearer for Windows (bug 747283)

media/css/mkt/purchase.less

@@ -176,7 +176,7 @@
             }
         }
         &.win {
-            b {
+            b:last-child {
                 background: url(../../img/mkt/icons/win-start.png) 5px 0 no-repeat;
                 background-size: 21px 20px;
                 padding: 0 0 0 31px;

mkt/detail/templates/detail/app.html

@@ -101,10 +101,15 @@
         {{ _('Installed!') }}
       </p>
       <p class="how mac">
-        Launch this app from your <b>Applications</b> directory.
+        {% trans %}
+          Launch this app from your <b>Applications</b> directory.
+        {% endtrans %}
       </p>
       <p class="how win">
-        Launch this app from your desktop or <b>Start Menu</b>.
+        {% trans %}
+          Launch this app from your <b>Windows desktop</b> or
+          <b>Start &#9658; All Programs</b>.
+        {% endtrans %}
       </p>
     </div>
   </section>