doc: 更新示例本地化资源文件

Author: ArgoZhang

src/BootstrapBlazor.Server/Locales/en-US.json

@@ -1813,7 +1813,9 @@
     "DropdownCascadeItem5": "Chaoyang",
     "DropdownCascadeItem6": "Haidian",
     "DropdownCascadeItem7": "Jingan",
-    "DropdownCascadeItem8": "Huangpu"
+    "DropdownCascadeItem8": "Huangpu",
+    "DropdownItemTemplateTitle": "Item Template",
+    "DropdownItemTemplateIntro": "By setting <code>ItemTemplate</code>, you can customize the content displayed in the drop-down item. In this example, the <code>Tooltip</code> component is used to add a tooltip function when the mouse is hovered."
   },
   "BootstrapBlazor.Server.Components.Samples.GoTops": {
     "Title": "GoTop",

src/BootstrapBlazor.Server/Locales/zh-CN.json

@@ -1813,7 +1813,9 @@
     "DropdownCascadeItem5": "朝阳区",
     "DropdownCascadeItem6": "海淀区",
     "DropdownCascadeItem7": "静安区",
-    "DropdownCascadeItem8": "黄浦区"
+    "DropdownCascadeItem8": "黄浦区",
+    "DropdownItemTemplateTitle": "下拉项模板",
+    "DropdownItemTemplateIntro": "通过设置 <code>ItemTemplate</code> 可以自定义下拉项显示内容，本例中通过自定义模板使用 <code>Tooltip</code> 组件增加鼠标悬浮是显示提示功能"
   },
   "BootstrapBlazor.Server.Components.Samples.GoTops": {
     "Title": "GoTop 返回顶端组件",