This is an example of how to use the Translator extension blocks to have your sprites 'speak' (text on the screen, not sound) in another language. In this example, I used French.
The extension can be found by clicking on the 'extension' icon on the bottom, LEFT of the screen - at the bottom of the code block menu. It is a purple square with two code blocks and a plus sign. Once you click on that, you find the "Translate text into many languages." extension. Then the translate blocks will be added to your list of code blocks.