zh_CN: fix a stupid typo

The typo makes this version 2019-04-01!  I'm an April FOOL!

translate-date.sh

@@ -5,9 +5,9 @@
 sed -e '/releasedate/s@"\([A-Za-z]*\) \([0-9]*\), \([0-9]*\)"@"\3 年 \1 月 \2 日"@' \
 	-e '/releasedate/s@Jan[a-z]*@1@' \
 	-e '/releasedate/s@Feb[a-z]*@2@' \
-	-e '/releasedate/s@May[a-z]*@3@' \
-	-e '/releasedate/s@Mar[a-z]*@4@' \
-	-e '/releasedate/s@Apr[a-z]*@5@' \
+	-e '/releasedate/s@Mar[a-z]*@3@' \
+	-e '/releasedate/s@Apr[a-z]*@4@' \
+	-e '/releasedate/s@May[a-z]*@5@' \
 	-e '/releasedate/s@Jun[a-z]*@6@' \
 	-e '/releasedate/s@Jul[a-z]*@7@' \
 	-e '/releasedate/s@Aug[a-z]*@8@' \