Update en_JP.xml

Author: AEApple

common/main/en_JP.xml

@@ -122,7 +122,7 @@ CLDR data files are interpreted according to the LDML specification (http://unic
 					</dateFormatLength>
 					<dateFormatLength type="medium">
 						<dateFormat>
-							<pattern>MMMM d, y</pattern>
+							<pattern>MMM d, y</pattern>
 							<datetimeSkeleton>yMMMd</datetimeSkeleton>
 						</dateFormat>
 					</dateFormatLength>