To manage translated blog posts we've created a special option. You can check it by clicking the language button above the blog posts. By default, it will display the original language of the store.
Click on it and choose the desired language. Blog posts, translated into this language, will appear. Here you will see info about the separate blog posts. For example, their status: translated, partial (partly translated), not translated. Manage them according to your needs.
Also, if you have a lot of posts, it's a very comfortable feature to search for the translated blog posts by their names. In the search field enter the name of the post (or some keyword) you want to find in the selected language. Choose the item you want to manage and make your changes.