Make use of the patterns in Intl number formatting

pkg/intl/lib/number_symbols.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 library number_symbols;
 
 /**
  * This holds onto information about how a particular locale formats numbers. It
  * contains strings for things like the decimal separator, digit to use for "0"
  * and infinity. We expect the data for instances to be generated out of ICU
  * or a similar reference source.
  */
-
 class NumberSymbols {
   final String NAME;
   final String DECIMAL_SEP, GROUP_SEP, PERCENT, ZERO_DIGIT, PLUS_SIGN,
       MINUS_SIGN, EXP_SYMBOL, PERMILL, INFINITY, NAN, DECIMAL_PATTERN,
       SCIENTIFIC_PATTERN, PERCENT_PATTERN, CURRENCY_PATTERN, DEF_CURRENCY_CODE;
 
   const NumberSymbols({this.NAME,
                        this.DECIMAL_SEP,
                        this.GROUP_SEP,
                        this.PERCENT,
                        this.ZERO_DIGIT,
                        this.PLUS_SIGN,
                        this.MINUS_SIGN,
                        this.EXP_SYMBOL,
                        this.PERMILL,
                        this.INFINITY,
                        this.NAN,
                        this.DECIMAL_PATTERN,
                        this.SCIENTIFIC_PATTERN,
                        this.PERCENT_PATTERN,
                        this.CURRENCY_PATTERN,
                        this.DEF_CURRENCY_CODE});
 
   toString() => NAME;
 }