bug 235872 - add description property to menuitems

r=neil, sr=bryner

suite/themes/modern/global/menu.css

@@ -77,6 +77,12 @@ menuitem[_moz-menuactive="true"][disabled="true"] {
   font-weight: inherit;
 }
 
+.menu-description {
+  font-style: italic;
+  color: #8C99AB;
+  margin-left: 1ex !important;
+}
+
 .menu-accel,
 .menu-iconic-accel {
   margin: 0px 2px 0px 7px !important;

suite/themes/modern/global/menulist.css

@@ -56,6 +56,12 @@ menulist {
   margin: 0 2px 0 0 !important;
 }
 
+.menulist-description {
+  font-style: italic;
+  color: #5D616E;
+  margin-left: 1em !important;
+}
+
 .menulist-icon {
   padding-right: 2px;
 }