Add string needed to support carrier wifi in UI.

    <!-- Summary for networks failing to connect due to association rejection status 17, AP full -->

    <string name="wifi_ap_unable_to_handle_new_sta">Access point temporarily full</string>

    <!-- Status message of Wi-Fi when it is connected to a Carrier Network. [CHAR LIMIT=NONE] -->

    <string name="connected_via_carrier">Connected via %1$s</string>

    <!-- Status message of Wi-Fi when an available network is a carrier network. [CHAR LIMIT=NONE] -->

    <string name="available_via_carrier">Available via %1$s</string>

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

    <string name="speed_label_very_slow">Very Slow</string>

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