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

lib/src/icu_parser.dart

 // Copyright (c) 2014, 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.
 
 /**
  * Contains a parser for ICU format plural/gender/select format for localized
  * messages. See extract_to_arb.dart and make_hardcoded_translation.dart.
  */
 library icu_parser;
 
@@ skipping 15 matching lines @@
   get icuEscapedText => quotedCurly | twoSingleQuotes;
   get curly => (openCurly | closeCurly);
   get notAllowedInIcuText => curly | char("<");
   get icuText => notAllowedInIcuText.neg();
   get notAllowedInNormalText => char("{");
   get normalText => notAllowedInNormalText.neg();
   get messageText => (icuEscapedText | icuText).plus().map((x) => x.join());
   get nonIcuMessageText => normalText.plus().map((x) => x.join());
   get twoSingleQuotes => string("''").map((x) => "'");
   get number => digit().plus().flatten().trim().map(int.parse);
-  get id => (letter() & (word() | char("_")).star()).flatten();
+  get id => (letter() & (word() | char("_")).star()).flatten().trim();
   get comma => char(",").trim();
 
   /**
    * Given a list of possible keywords, return a rule that accepts any of them.
    * e.g., given ["male", "female", "other"], accept any of them.
    */
   asKeywords(list) => list.map(string).reduce((a, b) => a | b).flatten().trim();
 
   get pluralKeyword => asKeywords(
       ["=0", "=1", "=2", "zero", "one", "two", "few", "many", "other"]);
@@ skipping 52 matching lines @@
 
   get stuff => (pluralOrGenderOrSelect | empty)
       .map((chunk) => Message.from(chunk, null));
 
   IcuParser() {
     // There is a cycle here, so we need the explicit set to avoid
     // infinite recursion.
     interiorText.set(contents.plus() | empty);
   }
 }