Update hello-world.md

Author: PPPDUD

docs/development/extensions/hello-world.md

@@ -51,7 +51,7 @@ Make sure to always call register() exactly once. If you don't call it, your ext
         {
           opcode: 'hello',
           blockType: Scratch.BlockType.REPORTER,
-          text: 'Hello, world!'
+          text: Scratch.translate('Hello, world!')
         }
       ]
     };