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