fix(docs): update npm command

Author: justingreenberg

docs/js/i18n.md

@@ -81,7 +81,7 @@ export default Footer;
 You can extract all i18n language within each component by running the following command:
 
 ```
-  npm run extractIntl
+  npm run extract-intl
 ```
 
 This will extract all language into i18n JSON files in `app/translations`.