Use "Drag and Drop Widgets" consistently

_data/locale/en/index.yml

@@ -26,7 +26,6 @@ gallery.sidebar_icons.png: "Icon links: Quick links or bookmarks"
 gallery.icons.png: "Top sites / icon links"
 gallery.focus.png: "Focus: just a clock and a searchbar"
 
-sfeatures.powerful.title: Powerful Widgets System
 sfeatures.powerful.desc: >-
   you can add, move, resize, and configure widgets on a grid using intuitive
   controls.

_data/store.yml

@@ -1,6 +1,6 @@
 features:
 
-- title: sfeatures.powerful.title
+- title: features.dnd.title
   desc: sfeatures.powerful.desc
 
 - title: features.backgrounds.title