Correct capitaliztion of "wi-fi" to "Wi-Fi".

    <!-- The "label" of the in-call Notification for an ongoing call. [CHAR LIMIT=60] -->

    <string name="notification_ongoing_call">Ongoing call</string>

    <!-- The "label" of the in-call Notification for an ongoing call, which is being made over

         wi-fi. [CHAR LIMIT=60] -->

    <string name="notification_ongoing_call_wifi">Ongoing wi-fi call</string>

         Wi-Fi. [CHAR LIMIT=60] -->

    <string name="notification_ongoing_call_wifi">Ongoing Wi-Fi call</string>

    <!-- The "label" of the in-call Notification for a call that's on hold -->

    <string name="notification_on_hold">On hold</string>

    <!-- The "label" of the in-call Notification for an incoming ringing call. [CHAR LIMIT=60] -->

    <string name="notification_incoming_call">Incoming call</string>

    <!-- The "label" of the in-call Notification for an incoming ringing call,

         which is being made over wi-fi. [CHAR LIMIT=60] -->

    <string name="notification_incoming_call_wifi">Incoming wi-fi call</string>

         which is being made over Wi-Fi. [CHAR LIMIT=60] -->

    <string name="notification_incoming_call_wifi">Incoming Wi-Fi call</string>

    <!-- The "label" of the in-call Notification for an incoming ringing video call. -->

    <string name="notification_incoming_video_call">Incoming video call</string>

    <!-- The "label" of the in-call Notification for upgrading an existing call to a video call. -->