Merge "Update foreground string in battery page" into oc-dev

    <!-- Description for text in battery footer. [CHAR LIMIT=120] -->

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

    <!-- Title for battery usage detail in foreground. [CHAR LIMIT=80] -->

    <string name="battery_detail_foreground">While using app</string>

    <string name="battery_detail_foreground">While in active use</string>

    <!-- Title for battery usage detail in background. [CHAR LIMIT=80] -->

    <string name="battery_detail_background">While in background</string>

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