New translations backend-events.md (Vietnamese)

i18n/vi/docusaurus-plugin-content-docs/version-1.x/extend/backend-events.md

@@ -4,10 +4,10 @@ Often, an extension will want to react to some events occuring elsewhere in Flar
 
 For a full list of backend events, see our [API documentation](https://api.docs.flarum.org/php/master/search.html?search=Event). Domain events classes are organized by namespace, usually `Flarum\TYPE\Event`.
 
-
 :::info [Flarum CLI](https://github.com/flarum/cli)
 
 You can use the CLI to automatically generate event listeners:
+
 ```bash
 $ flarum-cli make backend event-listener
 ```
@@ -32,6 +32,7 @@ return [
         ->listen(Deleted::class, PostDeletedListener::class)
 ];
 ```
+
 ```php
 class PostDeletedListener
 {
@@ -65,6 +66,7 @@ return [
         ->subscribe(PostEventSubscriber::class),
 ];
 ```
+
 ```php
 class PostEventSubscriber
 {
@@ -130,7 +132,9 @@ class SomeClass
 
 ## Custom Events
 
-As an extension developer you can define your own events to allow yourself (or other extensions) to react to events in your extension. Các sự kiện nói chung là các thể hiện của các lớp đơn giản (không cần mở rộng bất cứ điều gì). When defining a new event, you'll typically want to use public properties, and maybe some methods for convenience of users. For example, if we take a look at `Flarum\Post\Event\Deleted`, it's just a wrapping around some data:
+As an extension developer you can define your own events to allow yourself (or other extensions) to react to events in your extension.
+Các sự kiện nói chung là các thể hiện của các lớp đơn giản (không cần mở rộng bất cứ điều gì). When defining a new event, you'll typically want to use public properties, and maybe some methods for convenience of users.
+For example, if we take a look at `Flarum\Post\Event\Deleted`, it's just a wrapping around some data:
 
 ```php
 <?php