docs: provide CN translation for api-reference/system/esp_err and api-reference/bluetooth/esp_gatts

docs/en/api-reference/bluetooth/esp_gatts.rst

@@ -1,22 +1,24 @@
-GATT SERVER API
+GATT Server API
 ===============
 
-Application Example
+:link_to_translation:`zh_CN:[中文]`
--------------------
+
+Application Examples
+--------------------
 
 Check :example:`bluetooth/bluedroid/ble` folder in ESP-IDF examples, which contains the following demos and their tutorials:
 
-* This is a GATT sever demo and its tutorial. This demo creates a GATT service with an attribute table, which releases the user from adding attributes one by one. This is the recommended method of adding attributes.
+* This is a GATT server demo and its tutorial. This demo creates a GATT service with an attribute table, which releases the user from the operation of adding attributes one by one. This is the recommended method of adding attributes (officially recommended).
 
     - :example:`bluetooth/bluedroid/ble/gatt_server_service_table`
     - :example_file:`GATT Server Service Table Example Walkthrough <bluetooth/bluedroid/ble/gatt_server_service_table/tutorial/Gatt_Server_Service_Table_Example_Walkthrough.md>`
 
-* This is a GATT server demo and its tutorial. This demo creates a GATT service by adding attributes one by one as defined by Bluedroid. The recommended method of adding attributes is presented in example above.
+* This is a GATT server demo and its tutorial. This demo creates a GATT service by adding attributes one by one as defined by Bluedroid. The recommended method of adding attributes is presented in the example below.
 
     - :example:`bluetooth/bluedroid/ble/gatt_server`
     - :example_file:`GATT Server Example Walkthrough <bluetooth/bluedroid/ble/gatt_server/tutorial/Gatt_Server_Example_Walkthrough.md>`
 
-* This is a BLE SPP-Like demo. This demo, which acts as a GATT server, can receive data from UART and then send the data to the peer device automatically.
+* This is a demo similar to Bluetooth SPP. In this demo, GATT server can receive data from UART and then send the data to the peer device automatically.
 
     - :example:`bluetooth/bluedroid/ble/ble_spp_server`
 

docs/en/api-reference/system/esp_err.rst

@@ -1,11 +1,13 @@
-Error Codes and Helper Functions
+Error Code and Helper Functions
 ================================
 
+:link_to_translation:`zh_CN:[中文]`
+
 This section lists definitions of common ESP-IDF error codes and several helper functions related to error handling.
 
 For general information about error codes in ESP-IDF, see :doc:`Error Handling <../../api-guides/error-handling>`.
 
-For the full list of error codes defined in ESP-IDF, see :doc:`Error Code Reference <../error-codes>`.
+For the full list of error codes defined in ESP-IDF, see :doc:`Error Codes Reference <../error-codes>`.
 
 API Reference
 -------------

docs/zh_CN/api-reference/bluetooth/esp_gatts.rst

@@ -1 +1,29 @@
-.. include:: ../../../en/api-reference/bluetooth/esp_gatts.rst
+GATT 服务器 API
+=====================
+
+:link_to_translation:`en:[English]`
+
+应用示例
+-------------------
+
+以下示例及其教程存放在 ESP-IDF 示例的 :example:`bluetooth/bluedroid/ble` 目录下：
+
+* 以下为 GATT 服务器示例及其教程，该示例创建了一个带有属性表的 GATT 服务器，无需逐个添加属性。建议通过以下方式添加属性（官方推荐）。
+
+    - :example:`bluetooth/bluedroid/ble/gatt_server_service_table`
+    - :example_file:`GATT 服务器服务表示例 <bluetooth/bluedroid/ble/gatt_server_service_table/tutorial/Gatt_Server_Service_Table_Example_Walkthrough.md>`
+
+* 以下为 GATT 服务器示例及其教程，该示例逐个添加 Bluedroid 定义的属性，创建 GATT 服务。建议通过以下方式添加属性。
+
+    - :example:`bluetooth/bluedroid/ble/gatt_server`
+    - :example_file:`GATT 服务器示例 <bluetooth/bluedroid/ble/gatt_server/tutorial/Gatt_Server_Example_Walkthrough.md>`
+
+* 以下示例与 Bluetooth SPP 类似。在该示例中，GATT 服务器可以接收来自 UART 的数据，并将数据自动发送到对端设备。
+
+    - :example:`bluetooth/bluedroid/ble/ble_spp_server`
+
+API 参考
+-------------
+
+.. include-build-file:: inc/esp_gatts_api.inc
+

docs/zh_CN/api-reference/system/esp_err.rst

@@ -1 +1,16 @@
-.. include:: ../../../en/api-reference/system/esp_err.rst
+错误代码和辅助函数
+================================
+
+:link_to_translation:`en:[English]`
+
+本节列出了 ESP-IDF 中常见错误代码的定义，以及部分与错误处理相关的辅助函数。
+
+有关 ESP-IDF 中错误代码的基本信息，请参阅 :doc:`错误处理 <../../api-guides/error-handling>`。
+
+有关 ESP-IDF 定义的错误代码的完整列表，请参阅 :doc:`错误代码参考 <../error-codes>`。
+
+API 参考
+-------------
+
+.. include-build-file:: inc/esp_check.inc
+.. include-build-file:: inc/esp_err.inc