Update string for wifi calling.

    <!-- Wireless networks, item title to go into the WFC settings [CHAR LIMIT=30] -->

    <string name="wifi_calling_settings_title">Wi-Fi calling</string>

    <!-- Title of suggestion to turn on wifi calling [CHAR LIMIT=30] -->

    <string name="wifi_calling_suggestion_title">Turn on Wi-Fi Calling</string>

    <string name="wifi_calling_suggestion_title">Extend call coverage with Wi\u2011Fi</string>

    <!-- Summary of suggestion to turn on wifi calling [CHAR LIMIT=60] -->

    <string name="wifi_calling_suggestion_summary">Extend coverage by calling over Wi-Fi</string>

    <string name="wifi_calling_suggestion_summary">Turn on Wi\u2011Fi calling</string>

    <!-- Title of WFC preference item [CHAR LIMIT=30] -->

    <string name="wifi_calling_mode_title">Calling preference</string>

    <!-- Title of WFC preference selection dialog [CHAR LIMIT=30] -->