Allow spaces between the identifier and the translation when parsing ARB files

test/message_extraction/make_hardcoded_translation.dart

 #!/usr/bin/env dart
 // Copyright (c) 2013, 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.
 
 /**
  * This simulates a translation process, reading the messages generated
  * from extract_message.dart for the files sample_with_messages.dart and
  * part_of_sample_with_messages.dart and writing out hard-coded translations for
  * German and French locales.
@@ skipping 44 matching lines @@
       "}"
       "}"
       "female{"
       "{number,plural, "
       "=1{{names} était allée à la {place}}"
       "other{{names} étaient allées à la {place}}"
       "}"
       "}"
       "}",
   "outerPlural": "{n,plural, =0{rien}=1{un}other{quelques-uns}}",
-  "outerGender": "{g,select, male{homme}female{femme}other{autre}}",
+  "outerGender": "{g,select, male {homme} female {femme} other {autre}}",
   "pluralThatFailsParsing": "{noOfThings,plural, "
       "=1{1 chose:}other{{noOfThings} choses:}}",
   "nestedOuter": "{number,plural, other{"
       "{gen,select, male{{number} homme}other{{number} autre}}}}",
   "outerSelect": "{currency,select, CDN{{amount} dollars Canadiens}"
       "other{{amount} certaine devise ou autre.}}}",
   "nestedSelect": "{currency,select, CDN{{amount,plural, "
       "=1{{amount} dollar Canadien}"
       "other{{amount} dollars Canadiens}}}"
       "other{N'importe quoi}"
@@ skipping 85 matching lines @@
   parser.addOption("output-dir",
       defaultsTo: '.', callback: (value) => targetDir = value);
   parser.parse(args);
 
   var fileArgs = args.where((x) => x.contains('.arb'));
 
   var messages = JSON.decode(new File(fileArgs.first).readAsStringSync());
   translate(messages, "fr", french);
   translate(messages, "de_DE", german);
 }