diff --git a/frontend/app/javascript/dashboard/components-next/message/bubbles/Activity.vue b/frontend/app/javascript/dashboard/components-next/message/bubbles/Activity.vue
index 3528276b..9126cad7 100644
--- a/frontend/app/javascript/dashboard/components-next/message/bubbles/Activity.vue
+++ b/frontend/app/javascript/dashboard/components-next/message/bubbles/Activity.vue
@@ -8,7 +8,49 @@ import { useMessageContext } from '../provider.js';
 
 const { content, createdAt } = useMessageContext();
 
-const { locale } = useI18n();
+const { locale, t } = useI18n();
+
+const localizedContent = computed(() => {
+  const normalizedContent = String(content.value ?? '');
+  const resolvedBy = normalizedContent.match(
+    /^Conversation was resolved by (.+)$/
+  );
+  if (resolvedBy) {
+    const name = ['Anonymous Visitor', 'visitor'].includes(resolvedBy[1])
+      ? t('CONVERSATION.ACTIVITY.ANONYMOUS_VISITOR')
+      : resolvedBy[1];
+    return t('CONVERSATION.ACTIVITY.RESOLVED_BY', { name });
+  }
+  if (
+    normalizedContent ===
+    'Conversation was reopened due to agent bot webhook failure'
+  ) {
+    return t('CONVERSATION.ACTIVITY.BOT_WEBHOOK_FAILURE');
+  }
+  if (
+    normalizedContent ===
+    'CSAT survey not sent due to outgoing message restrictions'
+  ) {
+    return t('CONVERSATION.ACTIVITY.CSAT_RESTRICTED');
+  }
+  const linear = normalizedContent.match(
+    /^Linear issue (\S+) was (created|linked|unlinked) by (.+)$/
+  );
+  if (linear) {
+    const params = {
+      issueId: linear[1],
+      name: linear[3],
+    };
+    if (linear[2] === 'created') {
+      return t('CONVERSATION.ACTIVITY.LINEAR_CREATED', params);
+    }
+    if (linear[2] === 'linked') {
+      return t('CONVERSATION.ACTIVITY.LINEAR_LINKED', params);
+    }
+    return t('CONVERSATION.ACTIVITY.LINEAR_UNLINKED', params);
+  }
+  return normalizedContent;
+});
 
 const readableTime = computed(() => {
   if (locale.value === 'zh_CN') {
@@ -28,8 +70,8 @@ const readableTime = computed(() => {
     data-bubble-name="activity"
   >
     <span
-      v-dompurify-html="content"
-      :title="content"
+      v-dompurify-html="localizedContent"
+      :title="localizedContent"
       class="min-w-0 max-w-full [overflow-wrap:anywhere]"
     />
   </BaseBubble>
diff --git a/frontend/app/javascript/dashboard/components-next/message/bubbles/specs/Activity.spec.js b/frontend/app/javascript/dashboard/components-next/message/bubbles/specs/Activity.spec.js
index 78e4a907..f762ffa7 100644
--- a/frontend/app/javascript/dashboard/components-next/message/bubbles/specs/Activity.spec.js
+++ b/frontend/app/javascript/dashboard/components-next/message/bubbles/specs/Activity.spec.js
@@ -1,53 +1,108 @@
-import { mount } from '@vue/test-utils';
-import { ref } from 'vue';
-import { describe, expect, it, vi } from 'vitest';
+import { config, mount } from '@vue/test-utils';
+import { afterAll, beforeAll, describe, expect, it, vi } from 'vitest';
 
 import Activity from '../Activity.vue';
 
-vi.mock('vue-i18n', () => ({
-	useI18n: () => ({ locale: ref('zh_CN') }),
+const mocks = vi.hoisted(() => ({
+  content: '',
 }));
 
 vi.mock('shared/helpers/timeHelper', () => ({
-	messageTimestamp: () => '8月6日 下午 3:12',
+  messageTimestamp: () => '8月6日 下午 3:12',
 }));
 
 const longURL =
-	'https://ada.baidu.com/site/wjzt6ah8/agent?imid=e159aa97cd2c403f2fba76899e47615f&trinfo=XzFWIaclcWbzcMY&word=%E4%B8%89%E9%98%B3%E7%97%85%E6%AF%92%E6%90%BA%E5%B8%A6';
+  'https://ada.baidu.com/site/wjzt6ah8/agent?imid=e159aa97cd2c403f2fba76899e47615f&trinfo=XzFWIaclcWbzcMY&word=%E4%B8%89%E9%98%B3%E7%97%85%E6%AF%92%E6%90%BA%E5%B8%A6';
 
-vi.mock('../../provider.js', () => ({
-	useMessageContext: () => ({
-		content: ref(`来源页面：<a href="${longURL}">${longURL}</a>`),
-		createdAt: ref(1786018000),
-	}),
-}));
+const i18n = config.global.plugins.find(plugin => plugin.global?.locale);
+const initialLocale = i18n.global.locale.value;
+
+beforeAll(() => {
+  i18n.global.locale.value = 'zh_CN';
+});
+
+afterAll(() => {
+  i18n.global.locale.value = initialLocale;
+});
+
+vi.mock('../../provider.js', async () => {
+  const { ref } = await vi.importActual('vue');
+  return {
+    useMessageContext: () => ({
+      content: ref(mocks.content),
+      createdAt: ref(1786018000),
+    }),
+  };
+});
+
+const mountActivity = () =>
+  mount(Activity, {
+    global: {
+      directives: {
+        dompurifyHtml: (element, binding) => {
+          element.innerHTML = binding.value;
+        },
+      },
+      stubs: {
+        BaseBubble: {
+          template: '<div><slot /></div>',
+        },
+      },
+    },
+  });
 
 describe('Activity bubble', () => {
-	it('allows long links in system messages to wrap inside the bubble', () => {
-		const wrapper = mount(Activity, {
-			global: {
-				directives: {
-					dompurifyHtml: (element, binding) => {
-						element.innerHTML = binding.value;
-					},
-					tooltip: () => {},
-				},
-				stubs: {
-					BaseBubble: {
-						template: '<div><slot /></div>',
-					},
-				},
-			},
-		});
+  it('allows long links in system messages to wrap inside the bubble', () => {
+    mocks.content = `来源页面：<a href="${longURL}">${longURL}</a>`;
+    const wrapper = mountActivity();
 
-		expect(
-			wrapper.get('[data-bubble-name="activity"]').classes()
-		).toContain('max-w-full');
+    expect(wrapper.get('[data-bubble-name="activity"]').classes()).toContain(
+      'max-w-full'
+    );
 
-		const content = wrapper.get('span');
-		expect(content.classes()).toContain('min-w-0');
-		expect(content.classes()).toContain('max-w-full');
-		expect(content.classes()).toContain('[overflow-wrap:anywhere]');
-		expect(content.get('a').text()).toBe(longURL);
-	});
+    const content = wrapper.get('span');
+    expect(content.classes()).toContain('min-w-0');
+    expect(content.classes()).toContain('max-w-full');
+    expect(content.classes()).toContain('[overflow-wrap:anywhere]');
+    expect(content.get('a').text()).toBe(longURL);
+  });
+
+  it.each([
+    ['Conversation was resolved by Anonymous Visitor', '会话已由匿名访客解决'],
+    ['Conversation was resolved by Alice', '会话已由Alice解决'],
+    [
+      'Conversation was reopened due to agent bot webhook failure',
+      '由于客服机器人 Webhook 失败，会话已重新打开',
+    ],
+    [
+      'CSAT survey not sent due to outgoing message restrictions',
+      '由于发送消息受限，未发送 CSAT 调查',
+    ],
+    [
+      'Linear issue ENG-1 was created by Alice',
+      'Linear 问题 ENG-1 已由 Alice 创建',
+    ],
+    [
+      'Linear issue ENG-1 was linked by Alice',
+      'Linear 问题 ENG-1 已由 Alice 关联',
+    ],
+    [
+      'Linear issue ENG-1 was unlinked by Alice',
+      'Linear 问题 ENG-1 已由 Alice 取消关联',
+    ],
+  ])('localizes known backend activity content: %s', (content, expected) => {
+    mocks.content = content;
+    const wrapper = mountActivity();
+
+    expect(wrapper.get('[data-bubble-name="activity"] span').text()).toBe(
+      expected
+    );
+  });
+
+  it('renders an empty activity when content is null', () => {
+    mocks.content = null;
+    const wrapper = mountActivity();
+
+    expect(wrapper.get('[data-bubble-name="activity"] span').text()).toBe('');
+  });
 });
diff --git a/frontend/app/javascript/dashboard/i18n/locale/en/conversation.json b/frontend/app/javascript/dashboard/i18n/locale/en/conversation.json
index 00a82936..fdfbcad3 100644
--- a/frontend/app/javascript/dashboard/i18n/locale/en/conversation.json
+++ b/frontend/app/javascript/dashboard/i18n/locale/en/conversation.json
@@ -2,6 +2,15 @@
   "CONVERSATION": {
     "SELECT_A_CONVERSATION": "Please select a conversation from left pane",
     "CSAT_REPLY_MESSAGE": "Please rate the conversation",
+    "ACTIVITY": {
+      "ANONYMOUS_VISITOR": "Anonymous visitor",
+      "RESOLVED_BY": "Conversation was resolved by {name}",
+      "BOT_WEBHOOK_FAILURE": "Conversation was reopened because the agent bot webhook failed",
+      "CSAT_RESTRICTED": "CSAT survey was not sent due to outgoing message restrictions",
+      "LINEAR_CREATED": "Linear issue {issueId} was created by {name}",
+      "LINEAR_LINKED": "Linear issue {issueId} was linked by {name}",
+      "LINEAR_UNLINKED": "Linear issue {issueId} was unlinked by {name}"
+    },
     "404": "Sorry, we cannot find the conversation. Please try again",
     "SWITCH_VIEW_LAYOUT": "Switch the layout",
     "DASHBOARD_APP_TAB_MESSAGES": "Messages",
diff --git a/frontend/app/javascript/dashboard/i18n/locale/zh_CN/conversation.json b/frontend/app/javascript/dashboard/i18n/locale/zh_CN/conversation.json
index 67cd8d14..181bdcdd 100644
--- a/frontend/app/javascript/dashboard/i18n/locale/zh_CN/conversation.json
+++ b/frontend/app/javascript/dashboard/i18n/locale/zh_CN/conversation.json
@@ -2,6 +2,15 @@
   "CONVERSATION": {
     "SELECT_A_CONVERSATION": "请从左侧窗格选择一个对话",
     "CSAT_REPLY_MESSAGE": "请为会话评分",
+    "ACTIVITY": {
+      "ANONYMOUS_VISITOR": "匿名访客",
+      "RESOLVED_BY": "会话已由{name}解决",
+      "BOT_WEBHOOK_FAILURE": "由于客服机器人 Webhook 失败，会话已重新打开",
+      "CSAT_RESTRICTED": "由于发送消息受限，未发送 CSAT 调查",
+      "LINEAR_CREATED": "Linear 问题 {issueId} 已由 {name} 创建",
+      "LINEAR_LINKED": "Linear 问题 {issueId} 已由 {name} 关联",
+      "LINEAR_UNLINKED": "Linear 问题 {issueId} 已由 {name} 取消关联"
+    },
     "404": "抱歉，我们找不到对话。请重试",
     "SWITCH_VIEW_LAYOUT": "切换布局",
     "DASHBOARD_APP_TAB_MESSAGES": "消息",