Fix section "HTTP basic and digest authentication" in 14.4.md

en/14.4.md

@@ -10,12 +10,11 @@ Beego does not natively provide support for any of these three things, however y
 
 ## HTTP basic and digest authentication
 
-These two certifications are some applications using relatively simple authentication, there are already open source third-party library supports both authentication:
+Both HTTP basic and digest authentication are relatively simple techniques commonly used by web applications. There are already many open source third-party libraries which support these two authentication methods, such as:
 
 	github.com/abbot/go-http-auth
 
-The following code demonstrates how to use this library in order to achieve the introduction of beego Certification:
-
+The following code demonstrates how to use this library to implement authentication in a Beego application: 
 
 	package controllers
 	
@@ -49,7 +48,7 @@ The following code demonstrates how to use this library in order to achieve the
 		this.TplNames = "index.tpl"
 	}
 
-The above code takes advantage of beego the prepare function in the normal logic function is called before the certification, so it is very simple to achieve a http auth, digest authentication is the same principle.
+The above code takes advantage of Beego's `prepare()` function to perform authentication before allowing the normal flow of execution to proceed; as you can see, it's very simple to implement HTTP authentication. Digest authentication can be implemented in much the same way.
 
 ## OAuth and OAuth 2 certification