Revised language for notification ringtone picker.

Bug: 7659273
Change-Id: I5cb94a24b8ebff96ab5b567efc39a780300ee7ee
diff --git a/core/res/res/values/strings.xml b/core/res/res/values/strings.xml
index 80c2a13..99fbf95 100755
--- a/core/res/res/values/strings.xml
+++ b/core/res/res/values/strings.xml
@@ -3094,7 +3094,7 @@
     <!-- Choice in the ringtone picker.  If chosen, the default ringtone will be used. This fills in the actual ringtone's title into the message. -->
     <string name="ringtone_default_with_actual">Default ringtone (<xliff:g id="actual_ringtone">%1$s</xliff:g>)</string>
     <!-- Choice in the ringtone picker.  If chosen, there will be silence instead of a ringtone played. -->
-    <string name="ringtone_silent">Silent</string>
+    <string name="ringtone_silent">None</string>
     <!-- The title of the ringtone picker dialog. -->
     <string name="ringtone_picker_title">Ringtones</string>
     <!-- If there is ever a ringtone set for some setting, but that ringtone can no longer be resolved, t his is shown instead.  For example, if the ringtone was on a SD card and it had been removed, this woudl be shown for ringtones on that SD card. -->