Allow a single translation to be from multiple differently-named sources

pkg/intl/test/message_extraction/foo_messages_de_DE.dart

 /**
  * DO NOT EDIT. This is code generated via pkg/intl/generate_localized.dart
  * This is a library that provides messages for a de_DE locale. All the
  * messages from the main program should be duplicated here with the same
  * function name.
  */
 
 library messages_de_DE;
 import 'package:intl/intl.dart';
 import 'package:intl/message_lookup_by_library.dart';
 
 final messages = new MessageLookup();
 
 class MessageLookup extends MessageLookupByLibrary {
 
   get localeName => 'de_DE';
   static alwaysTranslated() => "Diese Zeichenkette wird immer übersetzt";
 
+  static differentNameSameContents() => "Hallo Welt";
+
   static escapable() => "Escapes: \n\r\f\b\t\v.";
 
   static leadingQuotes() => "\"Sogenannt\"";
 
   static message1() => "Dies ist eine Nachricht";
 
   static message2(x) => "Eine weitere Meldung mit dem Parameter $x";
 
   static message3(a, b, c) => "Zeichen, die Flucht benötigen, zB Schrägstriche \\ Dollar \${ (geschweiften Klammern sind ok) und xml reservierte Zeichen <& und Zitate \" Parameter $a, $b und $c";
 
@@ skipping 14 matching lines @@
   static outerGender(g) => "${Intl.gender(g, female: 'Frau', male: 'Mann', other: 'andere')}";
 
   static outerPlural(n) => "${Intl.plural(n, zero: 'Null', one: 'ein', other: 'einige')}";
 
   static outerSelect(currency, amount) => "${Intl.select(currency, {'CDN': '$amount Kanadischen dollar', 'other': '$amount einige Währung oder anderen.', })}";
 
   static pluralThatFailsParsing(noOfThings) => "${Intl.plural(noOfThings, one: 'eins:', other: '$noOfThings Dinge:')}";
 
   static plurals(num) => "${Intl.plural(num, zero: 'Ist Null Plural?', one: 'Dies ist einmalig', other: 'Dies ist Plural ($num).')}";
 
+  static sameContentsDifferentName() => "Hallo Welt";
+
   static staticMessage() => "Dies ergibt sich aus einer statischen Methode";
 
   static trickyInterpolation(s) => "Interpolation ist schwierig, wenn es einen Satz wie dieser endet ${s}.";
 
   static types(a, b, c) => "$a, $b, $c";
 
   static whereTheyWentMessage(name, gender, place) => "${Intl.gender(gender, female: '${name} ging zu ihrem ${place}', male: '${name} ging zu seinem ${place}', other: '${name} ging zu seinem ${place}')}";
 
 
   final messages = const {
     "alwaysTranslated" : alwaysTranslated,
+    "differentNameSameContents" : differentNameSameContents,
     "escapable" : escapable,
     "leadingQuotes" : leadingQuotes,
     "message1" : message1,
     "message2" : message2,
     "message3" : message3,
     "method" : method,
     "multiLine" : multiLine,
     "nestedMessage" : nestedMessage,
     "nestedOuter" : nestedOuter,
     "nestedSelect" : nestedSelect,
     "nonLambda" : nonLambda,
     "originalNotInBMP" : originalNotInBMP,
     "outerGender" : outerGender,
     "outerPlural" : outerPlural,
     "outerSelect" : outerSelect,
     "pluralThatFailsParsing" : pluralThatFailsParsing,
     "plurals" : plurals,
+    "sameContentsDifferentName" : sameContentsDifferentName,
     "staticMessage" : staticMessage,
     "trickyInterpolation" : trickyInterpolation,
     "types" : types,
     "whereTheyWentMessage" : whereTheyWentMessage
   };
 }