Add the <t> element and ignore whitespace outside it.

sky/examples/city-list/city-list.sky

Index: sky/examples/city-list/city-list.sky
diff --git a/sky/examples/city-list/city-list.sky b/sky/examples/city-list/city-list.sky
index e32112a31e35aefbb059aa5681373061805d7397..5d57d0b57a944a815cd7a690b494ab0da5e2aac8 100644
--- a/sky/examples/city-list/city-list.sky
+++ b/sky/examples/city-list/city-list.sky
@@ -89,10 +89,10 @@ module.exports.LetterHeaderElement = class extends SkyElement {
     #population {
       color: #AAA;
     }
-
   </style>
   <div>
-    <span id="name">{{ name }}</span>,
+    <span id="name">{{ name }}</span>
+    <t>, </t>
     <span id="population">population {{ population }}</span>
   </div>
 </template>