docs: update docs for the i18n plugin

Author: yaroslav8765

adminforth/documentation/docs/tutorial/08-Plugins/10-i18n.md

@@ -214,6 +214,10 @@ const adminForth = new AdminForth({
 
 ```
 
+> ⚠️ **Important**: Since version 2.0.0, this plugin requires the Background Jobs plugin to be set up. Go to the [Background Jobs Plugin page](/docs/tutorial/Plugins/background-jobs) and complete the setup.
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 This is it, now you should restart your app and see the translations resource in the menu. 
 
 You can add translations for each language manually or use Bulk actions to generate translations with AI completion adapter.