Updated 客户端多国语文案 (markdown)

@@ -679,4 +679,26 @@ The teacher/student has switched to voice call due to poor network conditions.
 您有新的课程！
 您有N节新增的课程，详情请查看【我的课表】。      
 Schedule Updated
-Some more lessons are scheduled for you; You can view details in Schedule.
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+Some more lessons are scheduled for you; You can view details in Schedule.
+
+网络刷新双方提示：
+1、刷新方：网络刷新成功。
+Page refreshed.
+
+      被刷新方：对方网络不好，刷新成功。
+The teacher/student refreshed the page.
+
+音视频切换双方提示：
+1、切换方：
+       a、已切换为语音通话
+Switched to voice call.
+
+       b、已切换为视频通话
+Switched to video call.
+
+2、被切换方：
+       a、对方网络不好，已切换为语音通话；
+The teacher/student has switched to voice call due to poor network conditions.
+
+       b、对方网络恢复畅通，已切换为视频通话；
+The teacher/student has switched to video call because the network is restored.
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