minor fixed

README_es.md

@@ -2,7 +2,7 @@
 <img src="documentation/figures/logo.png" width="60%" >
 </p>
 
-**English** | [中文](README_zh.md) |
+**Spanish** | [中文](README_zh.md) |
 
 [![GitHub](https://img.shields.io/github/license/RT-Thread/rt-thread.svg)](https://github.com/RT-Thread/rt-thread/blob/master/LICENSE)
 [![GitHub release](https://img.shields.io/github/release/RT-Thread/rt-thread.svg)](https://github.com/RT-Thread/rt-thread/releases)