Translate the plugin using .po file


I'm using WooCommerce, then i tried to translate to my local languages by following but it didn't works.

I’m sure that I did it the right way. But for sure, I tried to install the “Codestyling Localization” plugin and I still see the plugin indentified my translation text well but it still not display at the front-end. I don’t know why? (e.g. please go to the plugin and search “Add to cart”, you can see “Thêm vào gi?”)

After that, i also tried to translate my theme by using .po file and it still not works either.

Of course i cleaned the browser and w3tc cache.

Please using grant access to help me take a look. If you want to access my account FTP, please let me know.