Add toggle title for Data Saver

    <!-- Summary for the Data Saver feature being off [CHAR LIMIT=NONE] -->

    <string name="data_saver_off">Off</string>

    <!-- Switch label to enable the Data Saver feature [CHAR LIMIT=NONE] -->

    <string name="data_saver_switch_title">Use Data Saver</string>

    <!-- Title for switch to allow app unrestricted data usage [CHAR LIMIT=30] -->

    <string name="unrestricted_app_title">Unrestricted data usage</string>