Please check the video tutorial to see how to save the translation file correctly. You can remove the plugin and translations would remain. Also, translations would remain after each theme update.
In order to translate the WooCommerce strings, you need to create a separate translation in Loco > Plugins > WooCommerce in the same way as shown in the video.
Actually I tried this but it did not work for renaming !
I dont want to translate , I want to edit the text in the same language , could you please provide me with more detailed steps to do that ?