Content and fixes 2017-10-05 (#9165)

* fix(market): display classless equipment

* fix(challenges): more missing Markdown

* feat(content): backgrounds and Enchanted Armoire 2017-10

* chore(sprites): compile

website/client/components/challenges/challengeDetail.vue

@@ -74,7 +74,7 @@
         button.btn.btn-secondary(v-once, @click='cloneChallenge()') {{$t('clone')}}
     .description-section
       h2 {{$t('challengeSummary')}}
-      p {{challenge.summary}}
+      p(v-markdown='challenge.summary')
       h2 {{$t('challengeDescription')}}
       p(v-markdown='challenge.description')
 </template>