Added/fix metadata for extra/artemis

Signed-off-by: Pablo Lezaeta <prflr88@gmail.com>

extraponies/applejack.pony

@@ -1,11 +1,13 @@
 $$$
 BALLOON: top
+BASED ON: Generation 1 Aple Jack
 COAT: yellow
 DISPLAY: full, right, turn
 EYE: green
 FREE: no
 GROUP: mare, consept
 KIND: earth
+LINK: regular
 MANE: brown
 MEDIA: fanart
 NAME: Applejack (given by Lauren Faust)

extraponies/artemis.pony

@@ -3,10 +3,11 @@ BALLOON: top
 COAT: blue
 DISPLAY: full, left
 EYE: cyan
-FREE: free
+FREE: yes
 GROUP: stallion
 KIND: alicorn
-LICENSE: CC0
+LICENSE: CC0 (CC0 1.0 Universal)
+LINK: regular
 MANE: blue
 MEDIA: [fanfic: Wrong spell, On a Cross and Arrow]
 NAME: Prince Artemis
@@ -16,7 +17,15 @@ SOURCE: [jristz]
 WIDTH: 48
 HEIGHT: 28
 
+The person who associated a work with this deed has dedicated the work to
+the public domain by waiving all of his or her rights to the work worldwide under
+copyright law, including all related and neighboring rights, to the extent allowed
+by law.
 
+You can copy, modify, distribute and perform the work, even for commercial
+purposes, all without asking permission. See Other Information below.
+
+http://creativecommons.org/publicdomain/zero/1.0/legalcode
 $$$
 $balloon46$
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