Allow _resolvePlural to search _fallbackTranslation values when tryin…

…g to resolve a plural key (#559)

* resolve plural should not force fallback value to false

* revert just for sanity check

* _resolvePlural _resolve fallback value should consider if _fallbackTranslations is null or not

* update intl version for compatibility

* - revert intl versions in pubspec.yaml
- update test case for plural with fallback priority

---------

Co-authored-by: Kyle Cummings <kyle.cummings@thinkingbox.com>

lib/src/localization.dart

@@ -178,7 +178,7 @@ class Localization {
     if (subKey == 'other') return _resolve('$key.other');
 
     final tag = '$key.$subKey';
-    var resource = _resolve(tag, logging: false, fallback: false);
+    var resource = _resolve(tag, logging: false, fallback: _fallbackTranslations != null);
     if (resource == tag) {
       resource = _resolve('$key.other');
     }

test/easy_localization_test.dart

@@ -469,12 +469,12 @@ void main() {
         expect(Localization.instance.plural('hat_other', 1), 'other hats');
       });
 
-      test('other as fallback and fallback translations priority',
+      test('two as fallback and fallback translations priority',
           overridePrint(() {
         printLog = [];
         expect(
           Localization.instance.plural('test_fallback_plurals', 2),
-          '2 seconds', // isNot('fallback two'),
+          'fallback two',
         );
         expect(printLog, isEmpty);
       }));