Update the short and medium dateFormat descriptors for the ja bundle

cldr/nls/ja/gregorian.js

@@ -287,7 +287,7 @@ define(
 	"dateFormatItem-EHm": "H:mm (E)",
 	"field-mon-relative+0": "今週の月曜日",
 	"field-mon-relative+1": "来週の月曜日",
-	"dateFormat-short": "y/MM/dd",
+	"dateFormat-short": "y年M月d日",
 	"dateFormatItem-EHms": "H:mm:ss (E)",
 	"dateFormatItem-Ehms": "aK:mm:ss (E)",
 	"dayPeriods-format-narrow-noon": "正午",
@@ -300,7 +300,7 @@ define(
 	"dateFormatItem-Ed": "d日(E)",
 	"dateTimeFormats-appendItem-Timezone": "{0} {1}",
 	"field-week": "週",
-	"dateFormat-medium": "y/MM/dd",
+	"dateFormat-medium": "y年M月d日",
 	"field-year-relative+0": "今年",
 	"field-week-relative+-1": "先週",
 	"field-year-relative+1": "翌年",
@@ -314,4 +314,4 @@ define(
 	"field-week-relative+1": "翌週"
 }
 //end v1.x content
-);
+);