Volume a11y: Rename introduction 'confirm' button to 'close'.

For the benefit of screen readers.

Bug: 20813824
Change-Id: I776cf75d3c0f2e2d5b67bcbad476a28f9ef37c5f
diff --git a/packages/SystemUI/res/values/strings.xml b/packages/SystemUI/res/values/strings.xml
index 8466a5a..8606a59 100644
--- a/packages/SystemUI/res/values/strings.xml
+++ b/packages/SystemUI/res/values/strings.xml
@@ -424,8 +424,8 @@
     <string name="accessibility_desc_settings">Settings</string>
     <!-- Content description for the recent apps panel (not shown on the screen). [CHAR LIMIT=NONE] -->
     <string name="accessibility_desc_recent_apps">Overview.</string>
-    <!-- Content description for the confirm button in the zen mode panel introduction message. [CHAR LIMIT=NONE] -->
-    <string name="accessibility_desc_confirm">Confirm</string>
+    <!-- Content description for the close button in the zen mode panel introduction message. [CHAR LIMIT=NONE] -->
+    <string name="accessibility_desc_close">Close</string>
 
     <!-- Content description of the user tile in quick settings (not shown on the screen). [CHAR LIMIT=NONE] -->
     <string name="accessibility_quick_settings_user">User <xliff:g id="user" example="John Doe">%s</xliff:g>.</string>