[Regional] Change the wording from "Use app default" to "Usw default"

    <!-- The title of the menu entry of Numbers system preference. [CHAR LIMIT=50]  -->

    <string name="numbers_preferences_title">Numbers preferences</string>

    <!-- The summary of default string for each regional preference. [CHAR LIMIT=50] -->

    <string name="default_string_of_regional_preference">Use app default</string>

    <string name="default_string_of_regional_preference">Use default</string>

    <!-- The title of Celsius for preference of temperature unit. [CHAR LIMIT=50] -->

    <string name="celsius_temperature_unit">Celsius (\u00B0C)</string>

    <!-- The title of Fahrenheit for preference of temperature unit. [CHAR LIMIT=50] -->