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/common/script/content/appearance/backgrounds.js

@@ -563,6 +563,20 @@ let backgrounds = {
       notes: t('backgroundPixelistsWorkshopNotes'),
     },
   },
+  backgrounds102017: {
+    magical_candles: {
+      text: t('backgroundMagicalCandlesText'),
+      notes: t('backgroundMagicalCandlesNotes'),
+    },
+    spooky_hotel: {
+      text: t('backgroundSpookyHotelText'),
+      notes: t('backgroundSpookyHotelNotes'),
+    },
+    tar_pits: {
+      text: t('backgroundTarPitsText'),
+      notes: t('backgroundTarPitsNotes'),
+    },
+  },
   incentiveBackgrounds: {
     violet: {
       text: t('backgroundVioletText'),