Make CourseVictoryModal respect Markdown in next level description

app/templates/play/level/modal/progress-view.jade

@@ -38,7 +38,7 @@
               span :
             h2.text-uppercase= i18n(view.nextLevel.attributes, 'name')
             
-            p= i18n(view.nextLevel.attributes, 'description')
+            div!= view.nextLevelDescription
         
     .row
       .col-sm-5.col-sm-offset-2

app/views/play/level/modal/ProgressView.coffee

@@ -1,7 +1,8 @@
 CocoView = require 'views/core/CocoView'
+utils = require 'core/utils'
 
 module.exports = class ProgressView extends CocoView
-  
+
   id: 'progress-view'
   className: 'modal-content'
   template: require 'templates/play/level/modal/progress-view'
@@ -16,9 +17,12 @@ module.exports = class ProgressView extends CocoView
     @classroom = options.classroom
     @nextLevel = options.nextLevel
     @levelSessions = options.levelSessions
+    # Translate and Markdownify level description, but take out any images (we don't have room for arena banners, etc.).
+    # Images in Markdown are like ![description](url)
+    @nextLevelDescription = marked(utils.i18n(@nextLevel.attributes, 'description').replace(/!\[.*?\]\(.*?\)\n*/g, ''))
 
   onClickDoneButton: ->
     @trigger 'done'
 
   onClickNextLevelButton: ->
-    @trigger 'next-level'
+    @trigger 'next-level'