change comment to english

dubbo-config/dubbo-config-spring/src/main/java/com/alibaba/dubbo/config/spring/ServiceBean.java

@@ -73,13 +73,13 @@ public class ServiceBean<T> extends ServiceConfig<T> implements InitializingBean
         if (applicationContext != null) {
             SPRING_CONTEXT = applicationContext;
             try {
-                Method method = applicationContext.getClass().getMethod("addApplicationListener", new Class<?>[]{ApplicationListener.class}); // 兼容Spring2.0.1
+                Method method = applicationContext.getClass().getMethod("addApplicationListener", new Class<?>[]{ApplicationListener.class}); // backward compatibility to spring 2.0.1
                 method.invoke(applicationContext, new Object[]{this});
                 supportedApplicationListener = true;
             } catch (Throwable t) {
                 if (applicationContext instanceof AbstractApplicationContext) {
                     try {
-                        Method method = AbstractApplicationContext.class.getDeclaredMethod("addListener", new Class<?>[]{ApplicationListener.class}); // compatible with Spring2.0.1
+                        Method method = AbstractApplicationContext.class.getDeclaredMethod("addListener", new Class<?>[]{ApplicationListener.class}); // backward compatibility to spring 2.0.1
                         if (!method.isAccessible()) {
                             method.setAccessible(true);
                         }