renaming Sleep Mode feature.

Bug: 7267485
Change-Id: If54495436f0df1c0bf90f9bb77b043e40884bbd7

Author: cwren

packages/SystemUI/res/values/strings.xml

@@ -399,7 +399,7 @@
     <string name="jelly_bean_dream_name">BeanFlinger</string>
 
     <!-- Name of the launcher shortcut icon that allows dreams to be started immediately [CHAR LIMIT=20] -->
-    <string name="start_dreams">Start dreams</string>
+    <string name="start_dreams">Sleep Now</string>
 
     <!-- Textual description of Ethernet connections -->
     <string name="ethernet_label">Ethernet</string>