Don’t duplicate localization strings

Current launch banner should just use the intro.startCreating string for the call to action. Leaving the generic Call to Action in place for the next banner.

src/views/splash/feature/top-banner.jsx

@@ -21,7 +21,8 @@ const TopBanner = props => (
                 className="feature-call-to-action button"
                 href={props.actionLink}
             >
-                <FormattedMessage id="featureBanner.callToAction" />
+                {/* <FormattedMessage id="featureBanner.callToAction" /> */}
+                <FormattedMessage id="intro.startCreating" />
             </a>
         </FlexRow>
         <div className="feature-banner-images">

src/views/splash/l10n.json

@@ -40,5 +40,5 @@
 
     "featureBanner.title": "The new Scratch is here!",
     "featureBanner.subtitle": "not used",
-    "featureBanner.callToAction": "Start Creating"
+    "featureBanner.callToAction": "call to action"
 }