Updated strings for SystemUI. Fixes SystemUI FC when disabling Notifications.

         all of the currently visible notifications. [CHAR LIMIT=10]-->

    <string name="status_bar_clear_all_button">Clear</string>

    <!-- Title for the pseudo-notification shown when notifications are disabled (do-not-disturb

         mode) -->

    <string name="notifications_off_title">Notifications off</string>

    <!-- Content text for do-not-disturb mode notification -->

    <string name="notifications_off_text">Touch to enable notifications.</string>

    <!-- The text for the button in the notification window-shade that turns

         on do not disturb mode, where notifications no longer show their ticker,

         no sound plays, and no icons are visible.  The windowshade continues to show