/** The key of the configuration. e.g. 1000 */
    String STORAGE_MAX_ITEMS_IN_PAGE = "storage.max.items.in.page";

    /** The key of the configuration. e.g. admin */
    String PASSWORD_INVALID_ADMIN_PASSWORDS = "password.invalid.admin.passwords";

    /**
     * Get the value of property as {@link String}.
     * @param propertyKey The key of the property. (NotNull)

LT",nextWeek:"dddd [at] LT",lastDay:"[Yesterday at] LT",lastWeek:"[Last] dddd [at] LT",sameElse:"L"},longDateFormat:{LTS:"h:mm:ss A",LT:"h:mm A",L:"MM/DD/YYYY",LL:"MMMM D, YYYY",LLL:"MMMM D, YYYY h:mm A",LLLL:"dddd, MMMM D, YYYY h:mm A"},invalidDate:"Invalid date",ordinal:"%d",dayOfMonthOrdinalParse:/\d{1,2}/,relativeTime:{future:"in %s",past:"%s ago",s:"a few seconds",ss:"%d seconds",m:"a minute",mm:"%d minutes",h:"an hour",hh:"%d hours",d:"a day",dd:"%d days",M:"a month",MM:"%d months",y:"a year",yy:"%d...