navigationbar/res/values/strings.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <!-- Button for going to the next screen or step [CHAR LIMIT=40] -->
    <string name="setup_wizard_next_button_label">Next</string>

    <!-- Button for going to the previous screen or step [CHAR LIMIT=40] -->
    <string name="setup_wizard_back_button_label">Back</string>

</resources>