i18n(zh-CN): add Chinese translation

cosmic-applet-power/i18n/zh-CN/cosmic_applet_power.ftl

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+power = 电源
+settings = 设置...
+lock-screen = 锁定屏幕
+lock-screen-shortcut = Super + Escape
+log-out = 注销
+log-out-shortcut = Ctrl + Alt + Delete
+suspend = 中止
+restart = 重启
+shutdown = 关机
+confirm = 确认
+cancel = 取消
+confirm-button = {
+    $action -> 
+        [restart] { 重启 }
+        [suspend] { 中止 }
+        [shutdown] 关机
+        [log-out] { 注销 }
+        *[other] { 确认 }
+}
+confirm-title = 
+    确认要 { $action -> 
+        [restart] { 重启 }
+        [suspend] { 中止 }
+        [shutdown] { 关机 }
+        [log-out] 退出所有应用并注销
+        *[other] 应用所选操作
+    } 吗？
+confirm-body = 
+    系统将在 { $countdown } 秒内自动 { $action ->
+        [restart] 重启
+        [suspend] 中止
+        [shutdown] 关机
+        [lock-screen] 锁定屏幕
+        [log-out] 注销
+        *[other] 应用所选操作
+    }
+