feat($locale): Include original locale ID in $locale

Most systems use *IETF language tag* codes which are typically a combination
of the ISO 639 language code and ISO 3166-1 country code with an underscore
or hyphen delimiter. For example `en_US`, `en_AU`, etc.

Whilst the `$locale.id` comes close, the lowercase format makes it impossible
to transform to an IETF tag reliably. For example, it would be impossible
to deduce `en_Dsrt_US` from `en-dsrt-us`.

Closes #13390

Author: petebacondarwin

i18n/spec/closureI18nExtractorSpec.js

@@ -4,6 +4,7 @@ findLocaleId = closureI18nExtractor.findLocaleId;
 extractNumberSymbols = closureI18nExtractor.extractNumberSymbols;
 extractCurrencySymbols = closureI18nExtractor.extractCurrencySymbols;
 extractDateTimeSymbols = closureI18nExtractor.extractDateTimeSymbols;
+outputLocale = closureI18nExtractor.outputLocale;
 
 
 function newTestLocaleInfo() {
@@ -272,3 +273,10 @@ describe("serializeContent", function() {
   });
 });
 
+describe("outputLocale", function() {
+  it("should render the correct locale ids", function() {
+    var output = outputLocale(newTestLocaleInfo(), 'fr_CA');
+    expect(output).toContain('"id": "fr-ca"');
+    expect(output).toContain('"localeID": "fr_CA"');
+  });
+});

i18n/src/closureI18nExtractor.js

@@ -161,6 +161,7 @@ function outputLocale(localeInfo, localeID) {
   if (!localeObj.DATETIME_FORMATS) {
     localeObj.DATETIME_FORMATS = fallBackObj.DATETIME_FORMATS;
   }
+  localeObj.localeID = localeID;
   localeObj.id = correctedLocaleId(localeID);
 
   var getDecimals = [
@@ -201,10 +202,11 @@ function outputLocale(localeInfo, localeID) {
     DATETIME_FORMATS: localeObj.DATETIME_FORMATS,
     NUMBER_FORMATS: localeObj.NUMBER_FORMATS,
     pluralCat: localeObj.pluralCat,
-    id: localeObj.id
+    id: localeObj.id,
+    localeID: localeID
   };
 
-  var content = serializeContent(localeInfo[localeID]);
+  var content = serializeContent(localeObj);
   if (content.indexOf('getVF(') < 0) {
     getVF = '';
   }