package utils;

public class Constants {
    public static final String WARNING = "warning";
    public static final String INFO = "info";
    public static final String SUCCESS = "success";

    public static final String DEFAULT_LOGO_PATH = "public/uploadFiles/";

    public static final String RESOURCE_KEY_DELIM = "_";
    public static final String ADMIN_LOGIN_ID = "admin";
}

package utils;

public class Constants {
    public static final String WARNING = "warning";
    public static final String INFO = "info";
    public static final String SUCCESS = "success";

    public static final String DEFAULT_LOGO_PATH = "public/uploadFiles/";

    public static final String RESOURCE_KEY_DELIM = "_";
    public static final String ADMIN_LOGIN_ID = "admin";

    public static final String DEFAULT_LANGUAGE = "en";
}

Add DEFAULT_LANGUAGE (Constants)