Fix grammar and translations for summary of 12.5.md

Author: DeepAnchor

Diff for: en/12.5.md

@@ -1,20 +1,20 @@
 # 12.5 Summary
 
-This chapter discusses how to deploy and maintain Web applications we develop some related topics. The content is very important to be able to create a minimum maintenance based applications running smoothly, we must consider these issues.
+In this chapter, we discussed how to deploy and maintain our Go web applications. We also looked at some closely related topics which can help us to keep them running smoothly, with minimal maintenance. 
 
-Specifically, the discussion in this chapter include:
+Specifically, we looked at: 
 
-- Create a robust logging system that can record an error in case of problems and notify the system administrator
-- Handle runtime errors that may occur, including logging, and how to display to the user-friendly system there is a problem
-- Handling 404 errors, telling the user can not find the requested page
-- Deploy applications to a production environment (including how to deploy updates)
+- Creating a robust logging system capable of recording errors, and notifying system administrators
+- Handling runtime errors that may occur, including logging them, and how to relay this information in a user-friendly manner that there is a problem
+- Handling 404 errors and notifying users that the requested page cannot be found
+- Deploying applications to a production environment (including how to deploy updates)
 - How to deploy highly available applications
-- Backup and restore files and databases
+- Backing up and restoring files and databases
 
-After reading this chapter, for the development of a Web application from scratch, those issues need to be considered, you should already have a comprehensive understanding. This chapter will help you in the actual environment management in the preceding chapter describes the development of the code.
+After reading the contents of this chapter, those thinking about developing a web application from scratch should already have the full picture on how to do so; this chapter provided an introduction on how to manage deployment environments, while previous chapters have focused on the development of code.
 
 ## Links
 
 - [Directory](preface.md)
 - Previous section: [Backup and recovery](12.4.md)
-- Next chapter: [Build a web framework](13.0.md)
+- Next chapter: [Building a web framework](13.0.md)