doc: 增加多语言

Author: ArgoZhang

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

@@ -1626,7 +1626,9 @@
     "DropdownCascadeItem7": "Jingan",
     "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."
+    "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.",
+    "DropdownItemsTemplateTitle": "Items Template",
+    "DropdownItemsTemplateIntro": "You can customize all the content of the dropdown list by setting `<itemsTemplate>`. In this example, we use the `<DropdownItem>` component and `<DropdownDivider>` component to customize the dropdown list component."
   },
   "BootstrapBlazor.Server.Components.Samples.GoTops": {
     "Title": "GoTop",

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

@@ -1626,7 +1626,9 @@
     "DropdownCascadeItem7": "静安区",
     "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"
+    "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",
+    "DropdownItemsTemplateTitle": "下拉框模板",
+    "DropdownItemsTemplateIntro": "通过设置 <code>ItemsTemplate</code> 可以自定义下拉框所有内容，本例中通过使用 <code>DropdownItem</code> 组件与 <code>DropdownDivider</code> 对下拉框组件进行自定义"
   },
   "BootstrapBlazor.Server.Components.Samples.GoTops": {
     "Title": "GoTop 返回顶端组件",