You can follow the steps and the video tutorial below to manually translate the text using Translate My Store App.
- Go to the "Manual Translation" tool, and choose the categories you want to translate by using the filters.
- Click "Translate" to enter a categories translation configuration, all the filtered items will be listed
- You can input the translation, and then click the "Save Change" button to publish translations one by one.
Here is video tutorial, please take a look.