Merge "Update battery settings page footer string" into udc-dev

    <!-- Title for usage time that full charge lasts. [CHAR LIMIT=60] -->

    <string name="battery_full_charge_last">Full charge lasts about</string>

    <!-- Description for text in battery footer. [CHAR LIMIT=NONE] -->

    <string name="battery_footer_summary">Battery usage data is approximate and can change based on usage.</string>

    <string name="battery_footer_summary">Remaining battery life is approximate and can change based on usage</string>

    <!-- Title for battery usage amount by this app. [CHAR LIMIT=80] -->

    <string name="battery_detail_power_usage">Battery usage</string>