Time for action – translating product descriptions
Log in to your PrestaShop back office.
Hover over the Catalog tab and find the first product that you would like to translate. Click on the Edit icon and then click on the flag next to the Title box. Notice that since we've added a new language, you have an extra option to change the language.
Now we need to redo all the description and title fields in our new language. Let's go over and use Google Translate to help us. Visit http://translate.google.com/.
Select your "from" and "to" languages in the drop-down box, and copy and paste, individually, the descriptions and titles you want translated. Click on Translate, and copy and paste the translations back into their respective fields on the PrestaShop product page. A quick tip: as already mentioned, this is far from perfect. Consider shortening and simplifying the product descriptions. Click on Save when you're done.
Go and look at your shop front, change the setting to your new language, and...