docs: document i18n example for SW-update popup

Author: ulivz

Diff for: docs/guide/i18n.md

@@ -56,6 +56,13 @@ module.exports = {
         label: 'English',
         // text for the edit-on-github link
         editLinkText: 'Edit this page on GitHub',
+        // config for Service Worker 
+        serviceWorker: {
+          updatePopup: {
+            message: "New content is available.",
+            buttonText: "Refresh"
+          }
+        },
         // algolia docsearch options for current locale
         algolia: {},
         nav: [
@@ -70,6 +77,12 @@ module.exports = {
         selectText: '选择语言',
         label: '简体中文',
         editLinkText: '在 GitHub 上编辑此页',
+        serviceWorker: {
+          updatePopup: {
+            message: "发现新内容可用.",
+            buttonText: "刷新"
+          }
+        },
         nav: [
           { text: '嵌套', link: '/zh/nested/' }
         ],

Diff for: docs/zh/guide/i18n.md

@@ -53,6 +53,12 @@ module.exports = {
         selectText: 'Languages',
         label: 'English',
         editLinkText: 'Edit this page on GitHub',
+        serviceWorker: {
+          updatePopup: {
+            message: "New content is available.",
+            buttonText: "Refresh"
+          }
+        },
         algolia: {},
         nav: [
           { text: 'Nested', link: '/nested/' }
@@ -69,6 +75,13 @@ module.exports = {
         label: '简体中文',
         // 编辑链接文字
         editLinkText: '在 GitHub 上编辑此页',
+        // Service Worker 的配置
+        serviceWorker: {
+          updatePopup: {
+            message: "发现新内容可用.",
+            buttonText: "刷新"
+          }
+        },
         // 当前 locale 的 algolia docsearch 选项
         algolia: {},
         nav: [