Fix "OK" speed label string.

    <!-- Speed label for slow network speed -->

    <string name="speed_label_slow">Slow</string>

    <!-- Speed label for okay network speed -->

    <string name="speed_label_okay">Okay</string>

    <string name="speed_label_okay">OK</string>

    <!-- Speed label for medium network speed -->

    <string name="speed_label_medium">Medium</string>

    <!-- Speed label for fast network speed -->