Make standalone (non-browser) locale detection for windows also accept short locale names

pkg/intl/lib/intl_standalone.dart

Index: pkg/intl/lib/intl_standalone.dart
diff --git a/pkg/intl/lib/intl_standalone.dart b/pkg/intl/lib/intl_standalone.dart
index cce7722eead2d850eb85bba473e682789d92e7ba..fc22cf965dea8931ea0ac99379b989e402139010 100644
--- a/pkg/intl/lib/intl_standalone.dart
+++ b/pkg/intl/lib/intl_standalone.dart
@@ -52,7 +52,7 @@ Future<String> findSystemLocale() {
  * Regular expression to match the expected output of systeminfo on
  * Windows. e.g. System Locale:<tab>en_US;English (United States)
  */
-RegExp _sysInfoRegex = new RegExp(r"System Locale:\s+(\w\w-\w+);");
+RegExp sysInfoRegex = new RegExp(r"System Locale:\s+((\w\w;)|(\w\w-\w+;))");
 
 /**
  * Regular expression to match the expected output of reading the defaults
@@ -62,7 +62,7 @@ RegExp _sysInfoRegex = new RegExp(r"System Locale:\s+(\w\w-\w+);");
  *     "pt-PT",
  *     ...
  */
-RegExp _appleDefaultsRegex = new RegExp(r'(\w\w_\w+)');
+RegExp _appleDefaultsRegex = new RegExp(r'((\w\w)_\w+)');
 
 /**
  * Check to see if we have a "LANG" environment variable we can use and return
@@ -90,7 +90,7 @@ Future _getAppleDefaults() {
  */
 Future _getWindowsSystemInfo() {
   var p = Process.run('systeminfo', []);
-  var myResult = p.then((result) => _checkResult(result, _sysInfoRegex));
+  var myResult = p.then((result) => _checkResult(result, sysInfoRegex));
   return myResult;
 }