Add support for showing subscriber count. (#819)

src/locales/zh_Hans.json

@@ -45,8 +45,8 @@
         "most_recent": "最新的",
         "sort_by": "排序：",
         "view_subscriptions": "查看订阅",
-        "unsubscribe": "取消订阅",
-        "subscribe": "订购",
+        "unsubscribe": "取消订阅 - {count}",
+        "subscribe": "订购 - {count}",
         "loading": "正在加载...",
         "filter": "筛选",
         "search": "搜索",